1.what is the pH of a buffer prepared by adding .809 mol of weak acid Ha to 0.60

Question

1.what is the pH of a buffer prepared by adding .809 mol of weak acid Ha to 0.609 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA= 5.66x10^-7
2. 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
3 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 . what is the pH of a buffer prepared by adding o Boe mol of the weak acid HA to 0.608 mol of NaA in 2.00 Lof solution? The dissociation constant Ka of HA is 5.66 x 10 7. Express the pH numerically to three decimal places. pH Submit Hints My Answers Give Up Review Part art B What is the pH after o.150 mol of HCIis 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. pH Submit Hints My Answers Give Up Review Part 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.

Explanation / Answer

1. The given system represent acidic buffer.

We know that pH of acidic buffer is

pH=pKa+log(moles of salt/moles of acid)

pH=7-log(5.66)+log(0.609/0.809)=6.12

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