An unknown liquid was found in a science room and was analyzed by some Chemistry 20 students. To determine its possible identity, they attempted first to determine the pH using various indicators. The results of these tests were as follows: phenolphthalein stayed colourless • bromothymol blue turned yellow • methyl orange turned red • methyl violet stayed blue phenolphthalein stayed colourless Based on the results, what is the possible pH range of the unknown liquid? Show your work that leads you to determine the pH range.

An unknown liquid was found in a science room and was analyzed by some Chemistry 20 students. To determine its possible identity, they attempted first to determine the pH using various indicators. The results of these tests were as follows: phenolphthalein stayed colourless • bromothymol blue turned yellow • methyl orange turned red • methyl violet stayed blue phenolphthalein stayed colourless Based on the results, what is the possible pH range of the unknown liquid? Show your work that leads you to determine the pH range.

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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Similar questions

Two students were asked to determine the Kb of an unknown base. They were given a bottle with a solution in it. The bottle was labeled aqueous solution of a monoprotic strong acid. They were also given a pH meter, a buret, and an appropriate indicator. They reported the following data: volume of acid required for neutralization = 21.0 mL pH after 7.00 mL of strong acid added = 8.95 Use the students' data to determme the Kb of the unknown base.
A solution has a pH of 4.5. What would be the color of the solution if each of the following indicators were added? (See Fig. 14-8.) a. methyl orange b. alizarin c. bromcresol green d. phenolphthalein
When might a pH meter be better than an indicator to determine the end point of an acid-base titration?
Explain why an acid-base indicator changes color over a range of pH values rather than at a specific pH.