CAIE IGCSE Chemistry 3.1.3 Deduce the formula of a simple

Practise deducing simple compound formulae by comparing atom numbers in models, diagrams or given chemical formulae.

Exam points

use atom ratios in a model, diagram or formula to decide the correct compound formula

[Maximum number: 1]

Sulfur is a Group VI element.

An acid containing sulfur reacts with sodium hydroxide, NaOH , to form a salt and water. The salt has the formula $\mathrm{Na}_{2} \mathrm{SO}_{3}$ .

Deduce the formula of this acid.

$\mathrm{H}_{2} \mathrm{SO}_{3}$

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