Question

_______ salt of sodium contains 10 molecules of water of crystallization.

• A. $NaCl$
• B. ${NaNO}_3$
• C. ${Na}_2{CO}_3$
• D. $NaHCl$

Answer 1

The correct option is C

${\mathrm{Na}}_2{\mathrm{CO}}_3$

The explanation for the correct option (C):

• Sodium carbonate (${\mathrm{Na}}_2{\mathrm{CO}}_3$) is commonly known as Washing soda.
• Washing soda is Sodium carbonate with ten (10) molecules of crystallization Water (${\mathrm{H}}_2\mathrm{O}$). Thus, Washing soda is Sodium carbonate decahydrate (${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$).
• ${\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)+10{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}\left(\mathrm{aq}\right)$

Final Answer: Hence, option (C) is correct. ${\mathrm{Na}}_2{\mathrm{CO}}_3$ salt of Sodium ($\mathrm{Na}$) contains 10 molecules of Water of crystallization.