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CGP EDU Academic Team
Published on: August 13, 2026
Why is sodium carbonate extract acidified before performing the confirmatory test for anions ?
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Sodium carbonate extract in addition to the sodium salts of anions contain carbonate also. On heating with the test reagent carbonates of certain metals precipitate which interfere in the detection of acid redicals. Because of this, Na 2 CO 3 is decomposed by adding HCl, HNO 3 , H 2 SO 4 , depending upon the nature of test.
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