1.In the test for SO42–-, explain why the addition of acid will dissolve other

Question

1.In the test for SO42–-, explain why the addition of acid will dissolve other insoluble barium salts. Write the equation for the reaction of BaCO3 in acid solution.

2. Why do Br And I interfere with the NO3 test? Explain fully using bromide as an example, including equations.

3. Explain why an excess of Fe2+ is necessary for the NO3–test. 1.In the test for SO42–-, explain why the addition of acid will dissolve other insoluble barium salts. Write the equation for the reaction of BaCO3 in acid solution.

2. Why do Br And I interfere with the NO3 test? Explain fully using bromide as an example, including equations.

3. Explain why an excess of Fe2+ is necessary for the NO3–test.

Explanation / Answer

1) addition of H2SO4 dissolves the Ba salts as BaSO4 is formed which is soluble BaCO3 + H2SO4-----> BaSO4 + CO2 + H2O 2) Br and I interfere as Br2 and I2 are liberated when conc H2S0 3) excess of Fe2+ is required because some of the Fe2+ is converted to Fe3+ which reduces NO3- to NO

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