A buffer solution can be prepared from a mixture of
$1 .$ Sodium acetate and acetic acid in water
$2 .$ Excess sodium acetate and hydrochloric acid in water
$3 .$ Ammonia and ammonium chloride in water
$4 .$ Ammonia and sodium hydroxide in water.

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In all the 1, 2, 3 buffer solution can be prepared. In choice 2, when C H 3 C O O N a reacts with HCl it forms C H 3 C O O H + N a C l .

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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