Question

What happens when (write only balanced chemical equation):

[(a)] CO\(_2\) gas is passed in lime water for a long time
[(b)] Dry lime reacts with dry Cl\(_2\) gas
[(c)] Gypsum is heated
[(d)] Sodium metal reacts with water

Hint:

Write balanced equations by ensuring equal number of atoms of each element on both sides. Always include physical states (s, l, g, aq) in detailed answers if required.

Answer 1

[(a)] \(\text{Ca(OH)}_2 + \text{CO}_2 \rightarrow \text{CaCO}_3 \downarrow + \text{H}_2\text{O}\)
\(\text{CaCO}_3 + \text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{Ca(HCO}_3)_2\)
[(b)] \(\text{CaO} + \text{Cl}_2 \rightarrow \text{CaOCl}_2\)
[(c)] \(\text{CaSO}_4 \cdot 2\text{H}_2\text{O} \xrightarrow{\text{heat}} \text{CaSO}_4 \cdot \tfrac{1}{2}\text{H}_2\text{O} + \tfrac{3}{2}\text{H}_2\text{O}\)
[(d)] \(2\text{Na} + 2\text{H}_2\text{O} \rightarrow 2\text{NaOH} + \text{H}_2 \uparrow\)