Easy Acid-Base titration problem i think

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Discussion Overview

The discussion revolves around a chemistry problem related to acid-base titration, specifically focusing on the calculations for the volume of KOH needed to reach the equivalence point and the resulting pH at that point. The context is academic, as participants are addressing questions from a final exam in a chemistry course.

Discussion Character

  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant calculated that 33.1 mL of KOH is needed to reach the equivalence point but received a different answer on their exam.
  • Another participant agrees with the 33.1 mL calculation and suggests that the final pH at the equivalence point should be around 6.98 or 6.99, questioning whether the exam expected a more precise answer.
  • A third participant supports the correctness of the initial answers and expresses frustration over the grading, suggesting the participant deserves a higher score.

Areas of Agreement / Disagreement

Participants generally agree on the calculations for the volume of KOH and the expected pH at the equivalence point, but there is uncertainty regarding the grading of the exam and whether the answers provided were sufficient.

Contextual Notes

There is an implicit assumption that the titration involves a strong acid and strong base, which may influence the expected pH at the equivalence point. The discussion does not resolve the discrepancies in grading or the expectations of the exam.

gotmilk954
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Easy Acid-Base titration problem... i think URGENT!

So i just got my final exam for chem 2 back and i missed an A by two question. The thing is these two questions i was for sure i got right but apparently i didnt... here they are:

Use the following information: 50 mL solution of 0.053M HCL is titrated with .080M KOH
(I assumed a strong acid strong base titration)

First question:
How many ml KOH are needed to reach the equivalence point?
I put 33.1 mL which was wrong

Second question:
What would be the pH at the equivalence point?
I put 7 which was wrong

Any help?
 
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No help, I get the same answers. Odd.
 


33.1mL looks OK, final pH of 7 looks OK as well.

I can see a reason why final pH should be 6.98 or 6.99, but I doubt you were expected to dig that deep.
 


Third to attest the correctness of your answers. You deserve an A, so something's up.
 

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