Addition of phenolphthalein to an unknown colorless solution does not cause a color change. The addition of
Question:
Addition of phenolphthalein to an unknown colorless solution does not cause a color change. The addition of bromthymol blue to the same solution leads to a yellow color.
(a) Is the solution acidic, neutral, or basic?
(b) Which of the following can you establish about the solution: (i) A minimum pH, (ii) A maximum pH, or (iii) A specific range of pH values?
(c) What other indicator or indicators would you want to use to determine the pH of the solution more precisely?
Step by Step Answer:
a The above image shows the pH ranges of some indicators shown in the textbook Figure 168 p...View the full answer
Chemistry The Central Science
ISBN: 9780321910417
13th Edition
Authors: Theodore E. Brown, H. Eugene LeMay, Bruce E. Bursten, Catherine Murphy, Patrick Woodward, Matthew E. Stoltzfus
Related Video
A substance that alters color in solution over a constrained range of pH values is known as a pH indicator or acid-base indicator. The indicator chemical just needs to alter color slightly in order to be noticed. Indicators work on the basis that they react with water to produce the hydrogen cation H+ or hydronium ion H3O+. The indicator molecule\\\'s color changes as a result of the reaction. Since indicators have distinct color ranges for color change, they can occasionally be combined to provide color changes over a wider pH range.
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