1a2 marks
C6H5OH(aq) + H2O(l) C6H5O−(aq) + H3O+(aq) Ka = 1.12 × 10−10
Phenol is a weak acid that partially dissociates in water according to the equation
What is the pH of a 0.75 M C6H50H(aq) solution?
1b2 marks
For a certain reaction involving C6H5OH(aq) to proceed at a significant rate, the phenol must be primarily in its deprotonated form, C6H5O−(aq). In order to ensure that the C6H5OH(aq) is deprotonated, the reaction must be conducted in a buffered solution. On the number scale below, circle each pH for which more than 50 percent of the phenol molecules are in the deprotonated form (C6H5O−(aq)). Justify your answer.
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