Which type of indicator is used in Fajans-Fisher-Khodakov methodadsorption indicator;irreversible Red/Ox indicator;reversible Red/Ox indicator;metallochrome indicator;

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Chemical Principles in the Laboratory

11th Edition

ISBN:9781305264434

Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Chapter25: Ph Measurements-buffers And Their Properties

Section: Chapter Questions

Problem 1ASA

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What is an acidbase indicator? Define the equivalence (stoichiometric) point and the end point of a titration. Why should you choose an indicator so that the two points coincide? Do the pH values of the two points have to be within 0.01 pH unit of each other? Explain.
Explain why an acid-base indicator changes color over a range of pH values rather than at a specific pH.
For the analysis of a 50 mL sample consisting of carbonate mixtures, when the phenolphthalein indicator is added and titrated with 0.1 M HCl, 10 ml of acid is consumed until the turning point. Since the bromocresol indicator is added after the first turning point and 15 mL of HCl acid is added, find the number of moles in the initial solution..
An unknown solution is blue with indigo carmine and blue with thymolphthalein. From that information, predict the approximate pH range of the unknown solution, then determine the colour of the following indicators in that solution. Indicator Colour alizarin yellow R yellow/red/orange phenolphthalein colourless/pink thymol blue yellow/red/orange/green/blue
Each indicator gradually changes colour over a range of about how many pH units?
The equation Hin = H'+ In means? اختر احدى الدجابات A. The medium is acidic or basic B. Which form of indicator is predominates C. Indicators commonly change colors over a relatively wide pH range D. None of the above is correct
Giventhe following substances, identify the color with the indicator used (assuming that the solution is clear). Solution Indicator Color Reaction Substance Indicator Color reaction Vinegar Congo red Yellow Orange Juice Methyl yellow Milk Phenolphthalein purple Ariel liquid® Thymolphthalein Joy® dishwashing Bromothymol blue Shampoo Bromocresol blue Coffee Phenol red Safeguard® Methyl orange Milo drink® Methyl violet Lactacyd® Cresol red
Why were phenolphthalein chosen to be the indicator? What can other possible indicators substitute for phenolphthalein?
Which statement is FALSE for indicators? % %3D O Indicators are acids or bases whose various protonated forms have different colors, O The volume diffference between the equivalence point and the end point is indicator error, O Indicators can change color more than once. O Indicators are chosen to change color as close to the end point as possible, O The pH range over which an indicator changes color is the transition range
An indicator has a pk, of 7.63. In a solution with a pH of 9.35, the color in the solution will be due to which species or mix of species: O No answer text provided. O protonated indicator, Hln O indicator anion, In- O a mix of equal amounts of anion and unionized indicator
Complete this mixed-known qualitative analysis scheme. A draft is included for reference/example:
For a given indicator, Ka = 9.52 x 10-10. Around what pH will the indicator change color? Give your answer to three sig figs

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Which type of indicator is used in Fajans-Fisher-Khodakov method adsorption indicator; irreversible Red/Ox indicator; reversible Red/Ox indicator; metallochrome indicator;