Question

Consider 2.50 L of a buffer solution made from NaOH and 3.50 M H3PO4 at pH 2.11 that has a total concentration of phosphate containing species of 0.154M.

1. What volume of 3.50 M H3PO4 was required to make the buffer solution?
2. What mass of NaOH was required to make the buffer solution?
3. How many mL of 2.00 M HCl must be added to the buffer solution to change its pH by 1.25 units?
4. After the HCl is dissolved, is the solution still a buffer?

Answer 1