Question

13. Name two carbonates that do not decompose on heating.

Answer 1

Step 1: Carbonates that do not decompose on heating:

Two carbonates that do not decompose on heating are Sodium carbonate ${\mathrm{Na}}_2{\mathrm{CO}}_3$ and Potassium ${\mathrm{K}}_2{\mathrm{CO}}_3$carbonate. This happens due to the high electropositive character of both${\mathrm{Na}}^{+}$ and ${\mathrm{K}}^{+}$ metal ions which forms strong bonds with carbonate ion.

Step 2:Chemical equation involved:

All other metal carbonates decompose to the metal oxide and release Carbon dioxide ${\mathrm{CO}}_2$ gas on heating. This happens as per the given chemical reaction:

$$\begin{gathered} {\mathrm{M}}_2{\mathrm{CO}}_3\to \mathrm{MO}+{\mathrm{CO}}_2\uparrow \\ \mathrm{Metal}\mathrm{Metal}\mathrm{Carbon} \\ \mathrm{carbonate}\mathrm{oxide}\mathrm{Dioxide} \end{gathered}$$

Final Answer: Sodium carbonate ${\mathrm{Na}}_2{\mathrm{CO}}_3$ and Potassium carbonate ${\mathrm{K}}_2{\mathrm{CO}}_3$ do not decompose on heating.