Calculations of Buffers and Titrations Questionnaire

1. Calculate the pH of the buffer made of 0.25 M HCN and 0.15 M KCN (Ka HCN = 6.2 x10-10)

2. Match the following – A. B. C. D.

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Analyte – A. B. C. D.

Titratant – A. B. C. D.

equivalence point – A. B. C. D.

End pointA.

Solution containing the unknownB.

a solution of known concentrationC.

when the stoichiometric quantity of titrant and anlyteD.

when indicator changes color

3. When 50.0 mL of HOCl that is 0.025 M is titrated with 0.10 M NaOH (Ka 3.5 x10 -8)

What is the pH of the solution after 10.0 mL of NaOH was added to the acid

4. When 50.0 mL of HOCl that is 0.025 M is titrated with 0.10 M NaOH (Ka 3.5 x10 -8)

What is the pH of the solution after 15.0 mL of NaOH was added to the acid.

5. Optimal buffering occurs when base is [equal] to acid

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