Buffers Equations

Question 1

Adding an acid to a buffer?

Answer 1

The moles of acid added will:
Increase the moles of carboxylic weak acid in buffer by the same amount
Decrease the moles of carboxylate ion in buffer by same amount

Question 2

Find concentration changes after acid was added

Answer 2

Using new number of moles of weak acid + carboxylate ion:
Divide by new volume