JEE MAIN - Chemistry (2023 - 13th April Evening Shift - No. 2)
In the wet tests for detection of various cations by precipitation, $$\mathrm{Ba}^{2+}$$ cations are detected by obtaining precipitate of
$$\mathrm{BaSO}_{4}$$
$$\mathrm{Ba}(\mathrm{OAc})_{2}$$
$$\mathrm{BaCO}_{3}$$
$$\mathrm{Ba}(\mathrm{ox})$$ : Barium oxalate
Explanation
In the wet test for detection of Group 5 cations, including Ba²⁺, Ca²⁺, and Sr²⁺, ammonium carbonate ((NH₄)₂CO₃) is used as a group reagent. The reaction with barium ions (Ba²⁺) can be written as :
$$\mathrm{Ba}^{2+} + \left(\mathrm{NH}_4\right)_2\mathrm{CO}_3 \rightarrow \underset{\text{(white precipitate)}}{\mathrm{BaCO}_3 \downarrow} + 2\mathrm{NH}_4^+$$
Upon adding ammonium carbonate to the solution containing Ba²⁺ ions, a white precipitate of barium carbonate (BaCO₃) is formed, which can be used to identify the presence of barium ions in the sample.
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