Chemistry
Give three distinct tests [apart from using an indicator] you would carry out with solution of HCl to illustrate the typical properties of an acid.
Hydrogen Chloride
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Answer
(i) Action on metals — Hydrochloric acid reacts with metals above hydrogen in the activity series forming metallic chlorides and evolving hydrogen.
Ca + 2HCl ⟶ CaCl2 + H2 ↑
(ii) Action on oxides — Hydrochloric acid reacts with oxides to form salt and water only.
CuO + 2HCl ⟶ CuCl2 + H2O
(iii) With salts of weaker acids — Hydrochloric acid decomposes salts of weaker acids.
Na2CO3 + 2HCl ⟶ 2NaCl + H2O + CO2 ↑
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