Chemistry · Chemical principles involved in the qualitative salt analysis Anions: CO3(2-), S2-, SO4(2-), NO3-, NO2-, Cl-, Br-, I- (Insoluble salts excluded)
When water is added to an aqueous solution of potassium halide in the presence o
When \( C l_{2} \) water is added to an aqueous solution of potassium halide in the presence of chloroform, a violet color is obtained. On adding more of \( C l_{2} \) water, the violet color disappears and a colorless solution is obtained. This test confirms the presence of the following in aqueous solution:
- A. iodide
- B. bromide.
- C. chloride.
- D. iodide and bromide
Step-by-step solution
Chlorine water oxidizes iodide (I⁻) to iodine (I₂), which dissolves in chloroform to give a violet color. Excess chlorine further oxidizes iodine to colorless iodate (IO₃⁻), causing the violet color to disappear. This behavior is characteristic of iodide; bromide would produce a yellow/orange color (Br₂) that does not vanish with excess Cl₂ under these conditions.
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