If 1.0 ml of 10.0 M NaOH is added to a liter of the buffer prepared in question 4, how much will the pH change?

Group of answer choices

8.6

5.3

7.2

9.4

Q 4:

What is the pH of a mixture of 0.042 M NaH₂PO₄ and 0.058 M Na₂HPO₄? (Hint: the relevant pKa value here is 6.86).

Group of answer choices

7

4

13

9