An industrial chemist studying bleaching and sterilizing prepares several hypochlorite buffers. Find the pH of the following buffers.

(

A0.090 M HClO and 0.090 M NaClO (
B0.090 M HClO and 0.135 M NaClO (
C0.135 M HClO and 0.090 M NaClO (
DOne liter of the solution in part (
Aafter 0.0050 mol NaOH has been added.

I only need help with (

DI got 8.07, but that was incorrect

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 I got (a). The answer was 7.53. But when I try to solve (d), I keep getting the wrong answer. I subtracted the moles of NaOH from the acid and added the moles to the base. Then I did Ka = (x*([NaClO]+x))/([HClO - x) and then I found the pH