Question

Preparation of buffer solution of ammonium chloride and ammonium hydroxide

Answer 1

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Standard sodium chloride solution was prepared by dissolving 2.338gm of sodium chloride in 10ml of 3N hydrochloric acid and diluted to 1 litre. ... Ammonium hydroxide buffer solution was prepared by dissolving 67.5gm of ammonium chloride in 570ml of concentrated ammonium hydroxide and diluted to 1 litre.

Answer 2

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NH4OH, being a weak base, ionizes to a less extent while NH4Cl being a strong electrolyte ionizes almost completely. When a small amount of strong acid like HCl is added, the H+ ions combines with OH- to form un-dissociated water molecules. However, to maintain Ka constant, NH4OH dissociates more thus removing H+ ions.

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