Anion Test : Detection of Chloride ion (Cl-) in a salt sample | Chemistry practical | STD 9-12

Описание: When sodium chloride (NaCl) reacts with concentrated sulfuric acid (H2SO4), the following reaction occurs:

2 NaCl (s) + conc. H2SO4 (l) → NaHSO4 (aq) + HCl (g)

This reaction produces sodium bisulfate (NaHSO4) and hydrochloric acid (HCl) gas. The reaction is irreversible because the hydrogen chloride gas escapes from the medium.

Here are some other details about this reaction:

The concentrated sulfuric acid acts as a strong oxidizing agent, while the chloride ion acts as a weak reducing agent.

The reaction is a dehydration reaction, where concentrated sulfuric acid acts as a dehydrating agent.

The hydrogen chloride gas produced reacts with ammonia gas to produce dense white fumes of ammonium chloride gas.

Sulfuric acid is low volatile, so it can be used to manufacture more volatile acids from their corresponding salts.

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