Thermal decomposition can distinguish salts of the composition: a) NH4Cl and (NH4) 2CO3 b) NaCl and Na2SO4 c) NH4Cl and CaCO3 d) Ca (NO3) 2 and KNO
Ammonium salts decompose with the release of ammonia:
Decomposition of ammonium chloride NH4Cl = NH3 + HCl.
Decomposition of ammonium carbonate (NH4) 2СО3–> СО2 + H2О + NH3
In the first reaction, ammonia is released, determined by a sharp characteristic odor. In the second reaction, carbon dioxide is released. It is determined by the extinction of a smoldering speck.
Sodium chloride and sodium sulfate are salts that are resistant to degradation.
Ammonium chloride decomposes into ammonia and hydrogen chloride, calcium carbonate into calcium oxide and carbon dioxide.
Answer: a, c.
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