Relevant bibliographies by topics / Acid-alkali indicator

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Academic literature on the topic 'Acid-alkali indicator'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

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Journal articles on the topic "Acid-alkali indicator"

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A., K. Indrayan, and S. Guleria B. "Isolation of the natural dye from the heartwood of Caesalpinia sappan and its use as a new neutralization indicator." Journal of Indian Chemical Society Vol. 78, Sep 2001 (2001): 476–78. https://doi.org/10.5281/zenodo.5902540.

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Department of Chemistry, Gurukula Kangri University, Hardwar-249 404, India <em>E-mail</em> : akindray@nde.vsnl.net.in&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <em>&nbsp;Fax</em> : 91-0133-416366 <em>Manuscript received 27 June 2000, revised 22 March 2001, accepted 24 March 2001</em> Solution of natural dye from heartwood of the plant <em>Caesalpinia sappan </em>in ethanol is an excellent acid-alkali indicator, capable of working in much wider range than the usual indicators phenolphthalein and methyl orange. Volumetric titrations of strong acid-strong
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A., K. Indrayan, Yadav Vimla, Kumar Rajeev, and K. Tyagi Pradeep. "Isolation of the natural colorant from the roots of Arnebia nobilis and its use as a new neutralization indicator." Journal of India Chemical Society Vol 81, Aug 2004 (2004): 717–20. https://doi.org/10.5281/zenodo.5830366.

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Department of Chemistry, Gurukula Kangri University, Hardwar-249 404, India <em>E-mail</em>: akindray@sancharnet.in&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<em> Fax</em>: 91-1334-246366 <em>Manuscript received 27 June 2002, revised 3 March 2003. accepted 17 March 2004</em> .Solution of natural dye from the roots of the plant<em> Arnebia nobilis</em> in methanol is an excellent acid-alkali indicator capable of working in much wider range than the usual indicators phenolphthalein and methyl orange. Volumetric titrations of strong acid-strong alkali, strong acid-weak alkali and weak acid-strong alkali a
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Chen, Ling. "Macro Analysis Would Like to Drop Half a Drop of Solution." Advanced Materials Research 291-294 (July 2011): 3264–67. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.3264.

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By strong alkali (acid) titration strong acid (alkali), alkali (acid) titration mono-weak acid (alkali), precipitation titration and coordination titration to drop by half a drop, and settling the titration error specific terms, to illustrate the macro titration analysis would like to have drop half a drop of a solution. When strong alkali titrate strong acid or monobasic weak acid, there is no need to drop half a drop. As strong acid titrate strong alkali, there is must to drop half a drop as methyl orange for indicator. But phenolphthalein as indicator, there is doesn't need to drop half a d
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A., K. lndrayan. "Natural dyes as neutralization indicators-a short review." Journal of Indian Chemical Society Vol. 80, May 2003 (2003): 505–9. https://doi.org/10.5281/zenodo.5839478.

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Deparatment of Chemistry, Gurukula Kangri University, Hardwar-249 404, India <em>E-mail:</em> akindray@sancharnet.in <em>Manuscript received 12 November 2002</em> Some of the naturally occurring coloured substances are pH-sensitive giving distinctly different colours in acid and basic mediums. Some of them, like the red cabbage aqueous extract, are colour-sensitive even to the same medium pH variation also and make a very good laboratory experiment for pH determination. Anthocyanidins are among the commonly occurring natural pigments. Natural colours giving a sharp, distinct and stable colour
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Mukhitdinov, U., R. Sayfutdinov, M. Abdumavliyanova, and Sh Mirkamilov. "Extraction of cellulose from paulownia plants and its simple ester carboxymethyl cellulose (na-kms) technology." E3S Web of Conferences 371 (2023): 01018. http://dx.doi.org/10.1051/e3sconf/202337101018.

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In this experiment, Paulownia fiber plant is ground to 0.5-1 cm. In order to determine the optimum alkali solution concentration to extract cellulose from the raw material, the optimum degree of polymerization was determined by boiling in 25, 35, 50, 55 g/l solution. It can be seen from the table that certain properties of cellulose produced under the influence of different concentrations of alkali have different indicators. At alkaline concentration of 50 g/l, the cellulose yield was 49.6%, α-cellulose 89.5%, and the degree of polymerization was known in 1100 experiments. Ash content was a po
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Wang, Yujue, Yan Wang, Qian Zhang, et al. "Saline-Alkali Soil Property Improved by the Synergistic Effects of Priestia aryabhattai JL-5, Staphylococcus pseudoxylosus XW-4, Leymus chinensis and Soil Microbiota." International Journal of Molecular Sciences 24, no. 9 (2023): 7737. http://dx.doi.org/10.3390/ijms24097737.

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Two saline-alkali-tolerant bacterial strains, Priestia aryabhattai JL-5 and Staphylococcus pseudoxylosus XW-4, were isolated, with high capabilities of hydrolyzing phosphate and producing cellulase, respectively. The molecular mechanisms regulating the saline-alkali tolerance in the strain JL-5 were further investigated using transcriptome analysis. The contents of lactic acid and proline and the enzymatic activity of glutamine synthetase in the strain JL-5 were significantly increased. The properties of saline-alkali soils were significantly improved by the enhanced growth of the indicator pl
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Zubenko, S. O. "The simple method of vegetable oils and oleochemical products acid value determination." Catalysis and Petrochemistry, no. 31 (2021): 69–74. http://dx.doi.org/10.15407/kataliz2021.31.069.

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Acid value is one of the key technical characteristic of vegetable oils and oleochemicals, obtaining on its basis. The existing standard methods of acid value measurement are relatively complicated and have some disadvantages. There are including utilization of the significant amounts of solvents, throwing out as wastes, and necessity in special equipment for determination. Also, a special issue is visual indication of the equivalence point of indicator transfer from acid to alkali form for intensive colored oils’ samples. Visual indication of the color transfer of phenol-phthalein as indicato
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Zhang, Ai Li, Cai Cai Chang, and Yan Hong Jia. "Design of Formulation and Performance Research of Water-Borne Epoxy Modefied by 3-(trimethoxysilyl)propyl Methacrylate Anti-Corrosion Coatings." Applied Mechanics and Materials 713-715 (January 2015): 2644–48. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2644.

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A waterborne anticorrosive coatings was prepared with homemade organic silicone 3-(trimethoxysilyl) propyl methacrylate modified epoxy acrylate emulsion as basic material, glass flake as anticorrosive filter and titanium dioxide as pigment and other additives. The anti-acid alkali salt, AC impedance, polarization curve tests were done to evaluate the coatings’ anticorrosion properties and to optimal its formula and process. The results showed that the best formula was: glass flake 35%, particle size 80 meshes, titanium dioxide as anticorrosive pigment 18% and the emulsion with epoxy at 45% con
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Putri, Olivia Damayanti, Dharmi Wimi Pertiwi, and Bakti Wisnu Widjajani. "Utilization of Anthocyanin Extracted from Pletekan (Ruelliatuberosa L.) in Determination Soil pH." Journal of Tropical Horticulture 2, no. 2 (2019): 34. http://dx.doi.org/10.33089/jthort.v2i2.19.

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Pletekan (Ruelliatuberosa L.) is a flowering plant that grows wild. Pletekan has blue-purple flowers, containing the anthocyanin as its specific color. Anthocyanin is an organic material that can be used as an indicator of natural acid alkali, because the color of anthocyanin can ensure specific color changes when it reacts with materials at a certain pH as well. This research aimed to utilize anthocyanin extracted from pletekan as a determinant of soil pH. The used method was maceration extraction by soaking fresh pletekan flowers using maceration solvent (methanol acidified by HCl 1%) for 2-
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B., V. Shilpa* K. Nikitha N. Geethika Krishna K. Sindhu S. Neha Ch. Anusha. "Plant Extracts as Herbal Indicators." International Journal of Pharmaceutical Sciences 3, no. 3 (2025): 2465–71. https://doi.org/10.5281/zenodo.15084019.

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When the pH of the solution is altered by adding acid or alkali, indicators&mdash;which are highly specific compounds&mdash;will cause the solution's color to change. Red cabbage's actual color is blue. It will be somewhat blue after cutting it up and adding some tap water, but it will turn red when vinegar is added. This is because the color in red cabbage acts as a pH sensor. The aim of this study is to examine the possibility of using extracts of flower pigments in place of synthetic indicators. Synthetic indicators are costly, problematic in terms of supply, and hazardous chemically. An es
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Book chapters on the topic "Acid-alkali indicator"

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Morowitz, Harold J. "The Litmus Test." In Entropy and the Magic Flute. Oxford University PressNew York, NY, 1993. http://dx.doi.org/10.1093/oso/9780195081992.003.0036.

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Abstract IT’S DIFFICULT TO READ through a newspaper these days without encountering reference to a litmus test. Whether the article deals with appointing a Supreme Court justice or the director of the National Institutes of Health, the notion of such a test keeps working its way into the political rhetoric. To those of us who first encountered litmus in cherished childhood chemistry sets, the notion of a political litmus test impinges on the psyche in a strange way. Obviously, a more detailed understanding of litmus is called for. It begins, appropriately enough, with the 1911 edition of Encyc
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Gupta, Pawan. "Ophthalmology." In Oxford Assess and Progress: Emergency Medicine. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199599530.003.0020.

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Approximately 2% of ED attendances comprise patients with eye complaints. Most of the time this group of patients is seen by a junior doctor with very little training in thorough and relevant history taking and examination. The majority of such eye problems can be treated in the ED without requiring any intervention from an ophthalmologist. But a few may require immediate action and subsequent referral to the on-call ophthalmologist. Most of the emergencies require a standard approach to history taking followed by an examination, although some (acid or alkali burns) may need immediate treatmen
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Fesych, Igor, and Sergiy Nedilko. "METALOXIDE NANOPEROVSKITES: SYNTHESIS CONDITIONS AND CHARACTERIZATION." In Innovations in science: current research and advanced technologies. Publishing House “Baltija Publishing”, 2025. https://doi.org/10.30525/978-9934-26-531-0-7.

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Due to their unique functional properties, nanomaterials based on oxide perovskites are widely used in various industries. The unique physicochemical properties of perovskites with a general composition of ABO3 (A = La, alkali and/or alkaline earth metal, Ag; B = Mn, Fe, Co) are caused by the electronic structure of the 3-d metal, the competition of low-spin, intermediate spin, and high spin states, as well as the technological conditions for obtaining compounds. The purpose of the paper was to investigate the relationship between the chemical composition, crystal/defective structure and prope
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Conference papers on the topic "Acid-alkali indicator"

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Zhou, Bo, and Mingyang Zhang. "Shrinkage and microstructural evolution analysis of AAFS with tetrasodium of 1-hydroxy ethylidene-1, 1-diphosphonic acid (HEDP•4Na)." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.0251.

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&lt;p&gt;Alkali-activated materials (AAMs) are increasingly recognized as environmentally friendly alternatives to traditional Portland cement because of their reduced environmental impact. This study investigates the shrinkage behavior and microstructural changes in alkali-activated fly ash- slag hybrids (AAFS) containing tetrasodium 1-hydroxy ethylidene-1, 1-diphosphonic acid (HEDP•4Na). The study includes experimental analyses to measure shrinkage properties, evaluate phase changes in the microstructure, and assess the material's mechanical stability. The results indicate that HEDP•4Na sign
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Kawamura, H., H. Hirano, M. Koike, and M. Suda. "Inhibitory Effect of Boric Acid on Intergranular Attack and Stress Corrosion Cracking of Alloy 600 in High Temperature Water." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95408.

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Abstract The inhibitory effect of boric acid on the Intergranular Attack and Stress Corrosion Cracking (IGA/SCC) propagation behavior of steam generator (SG) tubing was studied under accelerated test conditions. Based on the analysis results of stress intensity factors at IGA/SCC crack tips, the notched C-ring tests were carried out to evaluate the effect of stress intensity and boric acid on the IGA/SCC crack propagation. The A.C. impedance measurement and Auger electron spectroscopy (AES) were also conducted to clarify the inhibitory effect of boric acid. Notched C-ring test results indicate
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Sabadash, Vira, Oleh Konovalov, Anna Nowik-Zajac, and Iwona Zawierucha. "Adsorption Properties of Natural and Synthetic Zeolites for Ammonium and Phosphate Removal from Wastewater." In 8th International Congress "Environment Protection. Energy Saving. Sustainable Environmental Management". Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-p0hfsd.

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Water resources are crucial in any region's overall natural resource complex. This research focuses on addressing these pollution issues through water treatment processes. The primary objective of this study was to examine the adsorption of phosphates using both natural and synthetic adsorbents, particularly aluminosilicates. Under static and dynamic conditions, the research assessed the sorption characteristics of natural zeolite, specifically clinoptilolite obtained from the Sokyrnytsia mineral deposits. Results indicated that the adsorption of phosphates is more effective in acidic environm
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He, Huarui, and Otto S. Wolfbeis. "Fluorescence-based optrodes for alkali ions based on the use of ion carriers and lipophilic acid/base indicators." In Microlithography '91, San Jose,CA, edited by Robert A. Lieberman and Marek T. Wlodarczyk. SPIE, 1991. http://dx.doi.org/10.1117/12.24786.

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Du, Yongbo, Chang’an Wang, Xiaoyang Wei, et al. "The Regeneration Effect of H2SO4 on V-W-TiO2 SCR Catalyst Deactivated by Alkali Metal." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3144.

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The sodium content in Zhundong coal is extremely high, which can accelerate the deactivation of the V-W-TiO2 selective catalytic reduction (SCR) catalysts. Sulfuric acid solution (H2SO4) washing has been verified as a famous method to regenerate the de-NOx performance for catalyst which has been poisoned by alkali metals. However, the performance of the regenerated catalyst in practice still needs to be investigated. In the present study, the resistance to sulfur dioxide (SO2) and the mechanical strength of the regenerated catalyst were experimentally studied as well as the continuous operatio
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Gupta, Vandana, Athira Nair, and Saurabh Pandey. "A SUSTAINABLE APPROACH FOR TREATMENT OF WASTEWATER USING CHICKEN FEATHERS." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/44.

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Since the last few decades, environmental remediation through a sustainable approach is gaining importance. One such attempt has been made in the present work to remove heavy metals from industrial effluents using one of the most prominent animal wastes, the chicken feathers. Biosorption has been a promising technique to remove heavy metals from industrial effluents. In the present work, cleaned but untreated chicken feathers were used to remove Cu(II) ions from electroplating industry wastewater. The physicochemical characteristics like colour, pH, ash content, iodine number and bulk density
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Zhao, X., Z. Chen, X. Liu, and C. Ding. "Preparation, Microstructure and Bioactivity of Plasma-Sprayed TiO2 Coating." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0397.

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Abstract In this paper, nano-structured TiO2 coatings have been successfully deposited onto titanium alloy substrates by atmospheric plasma spraying technology using optimized plasma parameters. A chemical treatment method was employed to induce bioactivity on the TiO2 surface. The bioactivity of as-sprayed and chemical treated TiO2 coatings were evaluated by investigating the formation of apatite on their surface after they were soaked in simulated body fluids (SBF) for a period of time. Microstructure and the phase composition of the as-sprayed coating and apatite were analyzed by Field-emis
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Tahir, M., A. Farzaneh, E. Hoffmann, et al. "Assessing Alkali-Polymer Interactions for EOR: Observations from Laboratory Evaluations and Field Application in Austria." In SPE Europe Energy Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/220103-ms.

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Abstract We investigate into optimizing alkali-polymer (AP) flooding in brownfields, focusing on the critical initiation of fluid-fluid and rock-fluid interactions for enhanced oil recovery. A detailed screening of the AP cocktail is vital for cost efficiency and for maximising the efficacy of the chemical slug. Our research outlines industry-standard laboratory methods to screen chemicals for AP pilots and field implementation, using the example of an AP pilot in Austria. The key to our screening process is fluid characterisation, enabling the selection of chemical concentrations suitable for
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Denduluri, Veerabhadra S., George Ulerio II, Moneeb Genedy, Maria Juenger, and Eric van Oort. "Experimental Investigation of Geopolymers for Application in High-Temperature and Geothermal Well Cementing." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212491-ms.

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Abstract With recurrent calls for a reduction in carbon emissions, geothermal energy has received increasing attention in recent years as a prominent source of clean energy. With current drilling technology, geothermal wells are being constructed in extremely challenging temperature environments, which could reach up to 600°F/315°C in-situ temperature and beyond. However, geothermal well-cementing technology has not changed much over the past few decades, with Ordinary Portland Cement (OPC) still being the primary choice of cementing material. OPC has several drawbacks such as brittle behavior
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Hossain, Mohammad K., Mohammad R. Karim, Mahmudur R. Chowdhury, et al. "Tensile Properties Evaluation of Chemically Treated/Untreated Single Sugarcane Fiber." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65664.

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Natural fiber as a reinforcing constituent can play a dominant role in the field of fiber reinforced polymer composites (FRPC) due to its eco-friendliness, renewability, abundance in nature, co2-neutrality, flexibility, low density, and low cost. Hence, sugarcane fiber can be a potential candidate to replace the synthetic FRPC. The objective of this study is to evaluate the effect of chemical treatment on the tensile properties of single sugarcane fiber. Sugarcane collected from the local market was cut into some specific length and fibers were extracted from the juicy section. These fibers we
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