NEED HELP CREATING BUFFER OF HClO & NAClO ... PLEASE!!!

Question

You are tasked with preparing a buffer of hypochlorous acid (HClO) and sodium hypochlorite (NaClO). To do so, you add 50 mL of 5.7 M hypochlorous acid and 25.7 g of sodium hypochlorite to 1.5 L of water. The pKa of hypochlorous acid is 7.53. What is the pH of the resulting buffer solution? What is the pH of the buffer after 15.0 mL of 1.0 M NaOH is added?

Answer 1

Without using the HH equation, you would start tge way tge HH equation is derived. For the weak acid HA, you have...

HA <==> H⁺ + A^-

Ka = [H⁺][A^-]/[HA] and rearranging....

[H⁺] = Ka[HA]/[A^-]

Plug in the values of concentrations after you calculate them, and use 2.95x10^-8 as the Ka (determined by taking antilog of the given pKa.

Solve for [H⁺] and then take the negative log to get pH.