Question

(f) Give balanced equations for the following:
(i) Aluminium powder is warmed with hot and concentrated caustic soda solution.
(ii) Preparation of methane from anhydrous sodium ethanoate.
(iii) Calcination of zinc carbonate.
(iv) Plumbo solvency of lead.
(v) Heating of sodium nitrate.

Answer 1

Given below are the balanced chemical equations for the following reactions:

(i) Aluminium powder is warmed with hot and concentrated caustic soda solution

$2\mathrm{Al}+2\mathrm{NaOH}+2{\mathrm{H}}_2\mathrm{O}\to 2{\mathrm{NaAlO}}_2+3{\mathrm{H}}_2$

(ii) Preparation of methane from anhydrous sodium ethanoate

${\mathrm{CH}}_3\mathrm{COONa}+\mathrm{NaOH}\underset{\mathrm{CaO}}{\overset{∆}{\to }}{\mathrm{CH}}_4+{\mathrm{Na}}_2{\mathrm{CO}}_3$

(iii) Calcination of zinc carbonate

${\mathrm{ZnCO}}_3\stackrel{∆}{\to }\mathrm{ZnO}+{\mathrm{CO}}_2$

(iv) Plumbo solvency of lead

$2\mathrm{Pb}+{\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}\to 2\mathrm{Pb}{\left(\mathrm{OH}\right)}_2$

(v) Heating of sodium nitrate

$2{\mathrm{NaNO}}_3\to 2{\mathrm{NaNO}}_2+{\mathrm{O}}_2$