Question

Identify the correct formula of sodium sulphate.

• A. $N{a}_{2}S{O}_4$
• B. $N{a}_{2}S{O}_3$
• C. $N{a}_{2}C{O}_3$
• D. $NaOH$

Answer 1

The correct option is A $N{a}_{2}S{O}_4$

Sodium is a cation with a valency of 1 while sulphate is an anion with a valency of 2. They can be represented with the chemical symbols as $N{a}^{+}$and $S{O}_4{}^{2-}$
Exchange of Valency:

$N{a}^{+}S{O}_4{}^{2-}$
$\searrow \swarrow$
$12$

Thus, the correct formula is $N{a}_{2}S{O}_4$.