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  • In both words and in terms of a mathematical equation, describe the relationship between pH and the ratio of base concentration to the acid concentration that you observed in this data.

  • Compare the addition of a strong acid to water to the addition of a strong acid to your buffer.  Suggest a reason for any difference you observed.

  • Describe the effect of diluting the acid.  Upon sufficient dilution, what would you predict your final pH to be?

  • Describe the effect of diluting the base.  Upon sufficient dilution, what would you predict your final pH to be?

  • Compare the pH values for your most diluted buffered sample to the undiluted sample.  Do the same for your acid and base samples.  

Data_on_a_discovery_chemistry_experiment_on_buffers.pdf
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Related questions

Include a brief (fewer than 4sentence) explanation foreach ofthe followingthat cites raw data or information gathered from plots:

a.In both words and in terms of a mathematical equation, describe the relationship between pH and the ratio of conjugate base to acid concentration that you observed in this experiment. Compare the plots of [conj. base]/[conj. acid] vs. pH and log([conj. base]/[conj. acid]) vs. pH

b.Compare the addition of a strong acid to water and the addition of a strong acid to your buffer. Suggest a reason for any difference you observe.

c.Describe the effect of diluting the acid. Upon sufficient dilution, what would you predict the final pH to be?

d.Compare the pH values for your most diluted buffer sample to the undiluted sample. Do the same for your acid and base samples. Do you notice any difference between the buffer and the acid or base? Suggest a reason for any difference you see.

1.) Include a brief (fewer than 4sentence) explanation for each of the following that cites raw data or information gathered from plots:

a. In both words and in terms of a mathematical equation, describe the relationship between pH and the ratio of conjugate base to acid concentration that you observed in this experiment. Compare the plots of [conj. base]/[conj. acid] vs. pH and log([conj. base]/[conj. acid]) vs. pH

b. Compare the addition of a strong acid to water and the addition of a strong acid to your buffer. Suggest a reason for any difference you observe.

c. Describe the effect of diluting the acid. Upon sufficient dilution, what would you predict the final pH to be?

d. Compare the pH values for your most diluted buffer sample to the undiluted sample. Do the same for your acid and base samples. Do you notice any difference between the buffer and the acid or base? Suggest a reason for any difference you see.

2.) A common biological buffer is a “phosphate buffer,” which involves the equilibrium between H2PO4^- and HPO4^(2)-, with a pKa at 25C of 6.86. Describe in words how you would prepare 500.mL of 0.250 M phosphate buffer at pH = 7.2, given appropriate glassware and 500. mL each of 0.250 M NaH2PO4 and 0.250 M Na2HPO4 at 25C. (Note: your explanation needs to include actual volumes, so this question requires calculations! It will be helpful to know that the concentrations of each component must add to the buffer concentration. i.e. [A-] + [HA] = 0.250 M)

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