A buffer is formed by dissolving 0.105 moles of HCIO, hypochorous acid; and 0.115 moles of NaCIO, sodium hypochlorite; in 200 ml of water. Ka = 3.0 X 10-8. a) Find the pH of the buffer. b) How does the pH compare with the pka? c) How much does the pH change when 2.00 ml of 0.50 M NaOH is added to the buffer? d) What would be the pH change if 2.00 ml of 0.50 M NaOH was added to 200 ml of pure H2O? e) How does this pH change compare to the addition of the same amount of 0.50 M NaOH to the buffer solution (as in c)?

A buffer is formed by dissolving 0.105 moles of HCIO, hypochorous acid; and 0.115 moles of NaCIO, sodium hypochlorite; in 200 ml of water. Ka = 3.0 X 10-8. a) Find the pH of the buffer. b) How does the pH compare with the pka? c) How much does the pH change when 2.00 ml of 0.50 M NaOH is added to the buffer? d) What would be the pH change if 2.00 ml of 0.50 M NaOH was added to 200 ml of pure H2O? e) How does this pH change compare to the addition of the same amount of 0.50 M NaOH to the buffer solution (as in c)?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter15: Additional Aqueous Equilibria

Section: Chapter Questions

Problem 31QRT

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

A buffer is formed by dissolving 0.105 moles of HCIO, hypochorous acid; and 0.115 moles of NaCIO, sodium
hypochlorite; in 200 ml of water. Ka 3.0 X 10-8. a) Find the pH of the buffer. b) How does the pH compare
with the pka? c) How much does the pH change when 2.00 ml of 0.50 M NaOH is added to the buffer? d)
What would be the pH change if 2.00 ml of 0.50 M NaOH was added to 200 ml of pure H2O? e) How does
this pH change compare to the addition of the same amount of 0.50 M NaOH to the buffer solution (as in c)?

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