Question

When washing soda is heated :

• A. CO is released
• B. $CO+C{O}_2$ is released
• C. $C{O}_2$ is released
• D. water vapour is released

Answer 1

The correct option is D water vapour is released

when washing soda was strongly heated, it loses all water of crystallization and become anhydrous sodium carbonate. The following reaction took place:

${Na}_{2}C{O}_3.10H_{2}O\underset{\Delta }{\overset{-{9H}_{2}O}{\to }}{Na}_{2}C{O}_3.H_{2}O\underset{\Delta }{\overset{-H_{2}O}{\to }}{Na}_{2}C{O}_3$

Thus when washing soda is heated it loses water vapour.