What is the pH of a 0.1 M solution of potassium hydrogen phthalate (KHP)?

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Question: What is the pH of a 0.1 M solution of potassium hydrogen phthalate (KHP)?

Options:

Correct Answer: 5.0

Solution:

KHP is a weak acid; its pKa is approximately 5.0, so the pH of a 0.1 M solution is around 5.0.

What is the pH of a 0.1 M solution of potassium hydrogen phthalate (KHP)?

What is the pH of a 0.1 M solution of potassium hydrogen phthalate (KHP)?

Step 1: Understand that potassium hydrogen phthalate (KHP) is a weak acid.
Step 2: Know that weak acids do not completely dissociate in water.
Step 3: Find the pKa value of KHP, which is approximately 5.0.
Step 4: Use the pKa value to estimate the pH of the solution.
Step 5: Since the concentration of KHP is 0.1 M, the pH will be close to the pKa value.
Step 6: Conclude that the pH of a 0.1 M solution of KHP is around 5.0.

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