CHEM RESEARCH TASK 1. INDICATORS Identify and describe some everyday uses of indicators including the testing of soil acidity/basicity. • Indicators are used regularly in chemical laboratories during chemical reactions. One important use is to determine the end point of a titration when an acid reacts with an alkali. The reactants and products of such a reaction are colourless so an indicator is a useful way to visually determine when the reaction is complete. Chemists also need to monitor
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reaction is termed titration. Endpoint It is the exact stage at which chemical reaction involved in the titration is just complete Indicator It is a substance which will show the end point of the reaction by change of colour. For example phenolphthalein and methyl orange are indicators used in acid alkali titrations. Potassium permanganate itself acts as an indicator in potassium permanganate titrations. Acidimetry and Alkalimetry Titration: Acidimentry refers to the titration of alkali with a standard
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10.2 Acid-Alkali Indicators 1. An acid-alkali indicator shows different colours in acids and alkalis. It can be used to test acids and alkalis. 2. Natural indicators can be made from some deeply coloured plants. 3. Acids turn blue litmus paper red whereas alkalis turn red litmus paper blue. Distilled water does not change the colour of litmus paper. It is a neutral substance. 4. The pH value shows the degree of acidity or alkalinity of a substance. 5. The pH value of a substance
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BH+ form against aqueous alkali in the presence of a phenolphthalein indicator. Suitable metrological parameters of acid value determination have been obtained. The advantages of the method are (i) absence of a toxic solvent‚ (ii) extraction and titration of acids at room temperature‚ and (iii) no need for preliminary neutralization of acid admixtures in a solvent. INTRODUCTION Acid value (AV) is an important indicator of vegetable oil quality. AV is expressed as the amount of KOH (in milligrams)
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BY: SH The Market Potential Index is used to compare countries that are in transition and entering the markets. This allows companies to determine if a country has the capacity to market a product successfully. Michigan State University Center for International Business Education and Research implements the study on a yearly basis in order to compare and rank the countries on market potential through eight different dimensions with a scale that ranges from one to one-hundred. It is important to
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3 drops of indicator was mixed and the solution was titrated with the standard acid (HCl) to the endpoint. Volumetric analysis is a quantitative analytical technique which employs a titration in comparing an unknown with a standard. A titration reaction may use two indicators‚ as in the analysis of carbonate-bicarbonate mixture. The two methods involved in this experiment were the classical method and the potentiometric method. In classical method‚ the endpoints of the two indicators (phenolphthalein
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solid acid. The equivalent mass of the solid acid will be determined from the volume of sodium hydroxide added at the equivalence point. The equilibrium constant‚ Ks‚ of the solid acid will be calculated from the titration curve obtained by plotting the pH of the solution versus the volume of sodium hydroxide added. III.Background Information: Volumetric analysis is the use of volume measurements to analyze an unknown; a method of this is titration. Titration is most often used to analyze the amount
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visual indicator for one of several reasons. Perhaps the analyst is color-blind to a particular indicator color change; there may not be a suitable color change available for a particular type of titration or the solutions themselves may be colored‚ opaque or turbid. It may be desired to automate a series of replicate determinations. In such situations‚ potentiometric titration‚ using a glass hydronium ion selective electrode‚ a suitable reference electrode and a sensitive potentiometer (a pH meter)
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Title: Measuring pH Levels Instructions: Enter the Virtual Lab‚ and conduct the experiments provided before going out into the virtual field for additional research. Please type your answers on this form. When your lab report is complete‚ submit it to the Submitted Assignments area of the Virtual Classroom. Part I: Answer the following questions while in the Phase 1 lab environment. Section 1: You will be testing 4 known solutions for pH levels using a standard wide-range indicator. Based off
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diameter of 300 ± 4 nm. Porins are embedded into the lipid membrane‚ allowing for the free substrate transport‚ but not that of the enzyme due to size limitations. The enzyme activity within the liposome is monitored using pyranine‚ a fluorescent pH indicator. The response of the liposome biosensor to the substrate acetylthiocholine chloride is relatively fast and reproducible‚ while the system is stable as has been shown by immobilization within sol–gel. © 2004 Elsevier B.V. All rights reserved. Keywords:
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