two weak acids + strong base

[sparkle123]

1. The problem statement, all variables and given/known data
0.5332 M CH3COOH
0.1219 M CH3COONa
0.100 M H2S

0.41452 M NaOH

what is the pH of the resulting solution?

2. Relevant equations

CH3COOH Ka=1.75E-5
H2S Ka1=9.6E-8, Ka2=1.3e-14

3. The attempt at a solution

I know that neutralisation will occur, but there is not enough strong base to neutralize all of the weak acids. How do you know how much of each acid the base will neutralize? How would you calculate pH then? I know if there was one weak acid you could use the Hendelson-Hasselbach equation but I don't know what do with two weak acids :(

[Borek]

Strongest acids are neutralized first.

Idea of using Henderson-Hasselbalch equation (http://www.chembuddy.com/?left=pH-calculation&right=pH-buffers-henderson-hasselbalch) is a right one, just start with the first hint and see what you get after using all base.

[NEILS BOHR]

yup
borek has provided u with almost all of the reqd. hints!!:tongue: