
Concept explainers
Interpretation: pH at which thymolphthalein changes color needs to be explained.
Concept Introduction: The color change for an indicator occurs when the

Answer to Problem 7E
Thymolphthalein changes color at pH 10.
Explanation of Solution
Color changes for an indicator is occurs if
Since, pH is the negative logarithm of
Therefore, pH is 10.
Thymolphthalein changes color at pH 10.
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