First slide

Acidic buffer

Question

Which may be added to one litre of water to act a buffer ?

Easy

A

One mole of ${CH}_{3} COOH$ and one mole of HCl
B

One mole of ${NH}_{4} OH$ and one mole of NaOH
C

One mole of ${NH}_{4} Cl$ and one mole of HCl
D

One mole of ${CH}_{3} COOH$ and 0.5 mole of NaOH

Solution

(4) Acetic acid is weak acid ,it forms salt ${CH}_{3} COONa$ with strong base NaOH.Hence it is a acidic buffer.
${HC}_{2} H_{3} O_{2} + NaOH \to C_{2} H_{3} O_{2} Na + H_{2} O 1 0.5 0 0 0.5 0 0.5 0.5$
This solution contains weak acid + its salt with strong base and thus acts as acidic buffer.

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