Question

Five drops of 1.0M NaOH increase the pH of a solution from 3.0 to 4.6. Five additional drops of 1.0M NaOH increase the pH to 4.7. These results are evidence that the solution is buffered with _____.

Answer 1

The solution is buffered with a weak acid and it's conjugate base. Since NaOH is a base, you can use a weak acid as it's buffer.