Question

Write the name of the compound sodium zincate.

Answer 1

The symbol of sodium is ‘$\mathrm{Na}$’, having a valency of 1⁺.

The formula of zincate is ‘${\mathrm{ZnO}}_2$’ with valency 2^-.

Step 1 –

Write the formula of sodium zincate:

Symbol Valency

Sodium $\mathrm{Na}$ 1⁺

Zincate ${\mathrm{ZnO}}_2$ 2^-

Step 2 –

Write each symbol with its valency:

${\mathrm{Na}}^{1+}$ ${{\mathrm{ZnO}}_2}^{2-}$

Step 3 –

Interchanging the valencies:

$$\begin{gathered} \mathrm{Na}{\mathrm{ZnO}}_2 \\ \searrow \swarrow \\ {1}^{+}{2}^{-} \end{gathered}$$

The formula of the compound sodium zincate would be ${\mathrm{Na}}_2{\mathrm{ZnO}}_2$.