Give balanced equations for the following conversions.
(a) Sodium zincate from zinc
(b) Sodium plumbite from lead
(c) Sodium aluminate from aluminium.
(a) Zn+2NaOH⟶Na2ZnO2[sodium zincate]+H2[g]\text{(a) } \text{Zn} + 2\text{NaOH} \longrightarrow \underset{\text{[sodium zincate]}}{\text{Na}_2\text{ZnO}_2} + \text{H}_2 \text{[g]}(a) Zn+2NaOH⟶[sodium zincate]Na2ZnO2+H2[g]
(b) Pb+2NaOH⟶Na2PbO2[sodium plumbite]+H2[g]\text{(b) } \text{Pb} + 2\text{NaOH} \longrightarrow \underset{\text{[sodium plumbite]}}{\text{Na}_2\text{PbO}_2} + \text{H}_2 \text{[g]}(b) Pb+2NaOH⟶[sodium plumbite]Na2PbO2+H2[g]
(c) 2Al+2NaOH+2H2O⟶2NaAlO2[sodium aluminate]+H2[g]\text{(c) } 2\text{Al} + 2\text{NaOH} + 2\text{H}_2\text{O}\longrightarrow \underset{\text{[sodium aluminate]}}{2\text{NaAlO}_2} + \text{H}_2 \text{[g]}(c) 2Al+2NaOH+2H2O⟶[sodium aluminate]2NaAlO2+H2[g]
