(C) The chemical formula of sodium sulfite is determined by the valency of its constituent ions.Sodium $(Na)$ has a valency of $+1$.The sulfite ion $(

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(C) The chemical formula of sodium sulfite is determined by the valency of its constituent ions.Sodium $(Na)$ has a valency of $+1$.The sulfite ion $(SO_{3}^{2-})$ has a valency of $-2$.To balance the charges,two sodium ions are required for every one sulfite ion.Therefore,the formula is $Na_{2}SO_{3}$.