Question

describe any three methods for preparing acids​

Answer 1

first take borax and mix it with acid tablet

Answer 2

1. By the reaction between an acidic oxide of a non-metal (acid anhydride) and water.

SO2(g) + H2O(l)  → H2SO3(aq)  Trioxosulphate(IV)

P4O10(s) + 2H2O(l) → 4HPO3(aq) Trioxophosphate(V)

2. Displacement of a weaker of more volatile acid from its salt by a stronger or less volatile acid.

NaCl(s) + H2SO4(aq) → NaHSO4(aq) + HCl(aq)

Na2B4O7(s) (Borax) + H2SO4(aq) + 5H2O(l) → Na2SO4(aq) +  4H3BO3(aq) (trioxoborate(III) acid)

3. Displacement of insoluble sulphide from a metallic salt by hydrogen sulphide.

Pb(C2H3O2)2(aq) + H2S(g) → PbS(s) + 2CH3COOH(aq) (Ethanoic acid)
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