Question

Which of the following will give a buffer solution when equal volumes of the two solutions...

Which of the following will give a buffer solution when equal volumes of the two solutions are mixed?

I.     0.10 M HNO3 and 0.10 M NaNO3

II.     0.10 M HCN and 0.10 M NaCN

III.     0.10 M HCl and 0.10 M NaCN

IV.     0.05 M NaOH and 0.10 M HCN

V.     0.20 M NaOH and 0.10 M HCN

A. II only

B. II, IV, and V

C. II and IV

D. I and II

E. I, II, III, IV, and V

Explain why the answer is the correct answer...

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Homework Answers

Answer #1

Buffer solution is made by the addition of weak acid and conjugate strong base or weak base with strong conjugate acid solution. The of this solution is remain unchanged by adding small amount of acid or base.   In general the of this solution is constant.

II.     0.10 M HCN and 0.10 M NaCN

Here HCN is a weak acid and NaCN is givens CN-; which is strong conjugate base.

pKa HCN = 9.21

pH = pKa + log ( [salt]/[acid])
pH = 9.21 + log (0.10/0.10)
pH = 9.21 + log 1.0
pH = 9.21 +0.0
pH = 9.21

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