2 < While using the Half Volume method, your solution was dark pink (you overshot the endpoint) and you added the unreacted acid to this solution. You refilled your buret between titrations of your unknown acid. Instead of using 0.1 M NaOH as you did for the first titration, you used 0.2 M NaOH. The pH buffers used to calibrate the pH meter were each 0.5 pH units high (4.5 and 7.5 rather than 4.0 and 7.0 respectively). 1. pka would be unchanged. 2. pka would be too high. 3. pka would be too low.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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4
While using the Half
Volume method, your
solution was dark pink (you
overshot the endpoint) and
you added the unreacted
acid to this solution.
You refilled your buret
between titrations of your
unknown acid. Instead of
using 0.1 M NaOH as you
did for the first titration,
you used 0.2 M NaOH.
The pH buffers used to
calibrate the pH meter were
each 0.5 pH units high (4.5
and 7.5 rather than 4.0 and
7.0 respectively).
1. pka would be unchanged.
2. pka would be too high.
3. pka would be too low.
Transcribed Image Text:4 While using the Half Volume method, your solution was dark pink (you overshot the endpoint) and you added the unreacted acid to this solution. You refilled your buret between titrations of your unknown acid. Instead of using 0.1 M NaOH as you did for the first titration, you used 0.2 M NaOH. The pH buffers used to calibrate the pH meter were each 0.5 pH units high (4.5 and 7.5 rather than 4.0 and 7.0 respectively). 1. pka would be unchanged. 2. pka would be too high. 3. pka would be too low.
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