Question

Match each circumstance to an outcome. (Two circumstances may have the same outcome.) 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. You decided to take the pH after each addition of 5.0 mL of NaOH rather than after every 0.5 mL during the neutralization of your acid sample. 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). While using the Half Volume method, your solution was dark pink (you overshot the endpoint) and you added the unreacted acid to this solution. 1. pKa would be unchanged. 2. pKa would be too high. 3. pKa would be too low.

          Match each circumstance to an outcome. (Two circumstances may have the same outcome.)

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.

You decided to take the pH after each addition of 5.0 mL of NaOH rather than after every 0.5 mL during the neutralization of your acid sample.

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).

While using the Half Volume method, your solution was dark pink (you overshot the endpoint) and you added the unreacted acid to this solution.

1. pKa would be unchanged.
2. pKa would be too high.
3. pKa would be too low.

Match each circumstance to an outcome. (Two circumstances may have the same outcome.)

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.

You decided to take the pH after each addition of 5.0 mL of NaOH rather than after every 0.5 mL during the neutralization of your acid sample.

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).

While using the Half Volume method, your solution was dark pink (you overshot the endpoint) and you added the unreacted acid to this solution.

1. pKa would be unchanged.
2. pKa would be too high.
3. pKa would be too low.

Added by Kimberly P.

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