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Which can act as buffer?

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in Biochemistry by (89.2k points)
Which can act as buffer?

(a) NH4 Cl + HCl

(b) CH3 COOH + H2 CO3

(c) 40ml of 0.1M NaCN + 20ml of 0.1M HCN

(d) NaCl + NaOH

The question was asked in an online interview.

This intriguing question originated from Buffering against pH changes in Biological Systems in section Water Basics of Biochemistry

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Right answer is (c) 40ml of 0.1M NaCN + 20ml of 0.1M HCN

Easy explanation: It is a mixture of weak acid and its salt with strong base.

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