White solid E reacts with sodium hydroxide to form Solution A and ammonium gas,and when Solution A reacts with hydrochloric acid to give off carbon dioxide.What is white solid E and Sultion A?Thanks


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Posted on (Answer #1)

When a solution of an ammonium salt is heated with NaOH, ammonia gas is liberated. Carbonate salts when treated with mineral acids (e.g. HCl) produces carbonic acid which readily decomposes into carbon dioxide and water.  So, solid E must be an ammonium salt and solution A must contain carbonate. Therefore, the best match for solid E is ammonium carbonate, (NH4)2CO3, and solution A contains sodium carbonate in water. The reactions are:  

(NH4)2CO3 + 2NaOH = 2NH3 (g) + Na2CO3 + 2H2O

Na2CO3 + 2HCl = H2CO3 + NaCl

H2CO3 = H2O + CO2 (g)


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