Part A What is the pH of a buffer prepared by adding 0.809 mol of the weak acid

Question

Part A

What is the pH of a buffer prepared by adding 0.809 mol of the weak acid HA to 0.305 mol of NaAin 2.00 L of solution? The dissociation constant Ka of HA is 5.66×107.

Express the pH numerically to three decimal places.

5.823

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Correct

Since both the acid and base exist in the same volume, we can skip the concentration calculations and use the number of moles in the Henderson-Hasselbalch equation to calculate the pH. The answer will be the same.

Part B

What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid.

Express the pH numerically to three decimal places.

5.92

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Part C

What is the pH after 0.195 mol of NaOH is added to the buffer from Part A? Assume no volume change on the addition of the base.

Express the pH numerically to three decimal places.

6.31

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5.823

Explanation / Answer

I'm unable to attach answers in image format using the upload option. So,. please see the comment option below the question for link to the answer.

Thanks,

Ranjan

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