Which of the following combination can form an acid buffer?

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100 ml of 0.1 M ${CH}_{3} COOH$ + 100 ml of 0.1 M NaOH

100 ml of 0.2 M NaOH +100 ml of 0.1 M HCl

100 ml of 0.2 M ${CH}_{3} COOH$ +100 ml of 0.1 M NaOH

50 ml of 0.1 M ${CH}_{3} COOH$ +50 ml of 0.2 M NaOH

answer is C.

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Detailed Solution

The mixture of weak acid and strong base will act as an acidic buffer, if the number of equivalents of weak acid are greater than that of strong base
Number of equivalents = Normality × Volume in litre
Number of equivalents of acetic acid = 0.2 × 0.1 = 0.02
Number of equivalents of Sodium hydroxide = 0.1 × 0.1 = 0.01

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