Calculating pH of a solution with two weak acids and a strong base

In summary, the given solution contains 0.5332 M CH3COOH, 0.1219 M CH3COONa, 0.100 M H2S, and 0.41452 M NaOH. The pH of the resulting solution can be calculated using the Henderson-Hasselbalch equation, starting with the first hint and using all of the base. The Henderson-Hasselbalch equation can be used because there are two weak acids present, and the strongest acids will be neutralized first. Borek has provided most of the necessary hints for solving this problem.
  • #1
sparkle123
175
0

Homework Statement


0.5332 M CH3COOH
0.1219 M CH3COONa
0.100 M H2S

0.41452 M NaOH

what is the pH of the resulting solution?

Homework Equations



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

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 :(
 
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  • #2
Strongest acids are neutralized first.

Idea of using Henderson-Hasselbalch equation is a right one, just start with the first hint and see what you get after using all base.
 
  • #3
yup
borek has provided u with almost all of the reqd. hints!:tongue:
 

1. What happens when two weak acids react with a strong base?

When two weak acids react with a strong base, the resulting solution will have a pH that is closer to neutral than the individual acid solutions. This is because the strong base will neutralize the acidic solutions, resulting in a higher pH.

2. How does the strength of the two acids affect the reaction with a strong base?

The strength of the two acids will determine the initial pH of the solutions and the rate of neutralization. Stronger acids will have a lower initial pH and will neutralize more quickly compared to weaker acids.

3. Can two weak acids completely neutralize a strong base?

Yes, two weak acids can completely neutralize a strong base. However, it may take longer for the neutralization to occur compared to using a strong acid.

4. What is the resulting salt from the reaction between two weak acids and a strong base?

The resulting salt will depend on the specific acids and base used in the reaction. In general, it will be a salt formed from the cation of the strong base and the anions of the weak acids.

5. How can the endpoint of the reaction between two weak acids and a strong base be determined?

The endpoint of the reaction can be determined by using an indicator or by monitoring the pH of the solution. When the pH reaches a certain value, it indicates that the neutralization is complete.

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