<u>Answer:</u> The major ionic species present in the solution are sodium and sulfate ions.
<u>Explanation:</u>
Sodium sulfate is an ionic compound because it is formed by the complete transfer of electrons from sodium ions to sulfate ions.
When an ionic compound is dissolved in water, it dissociates into its corresponding ions.
The chemical equation for the ionization of sodium sulfate follows:
By Stoichiometry of the reaction:
1 mole of aqueous solution of sodium sulfate produces 2 moles of sodium ions and 1 mole of sulfate ions.
Hence, the major ionic species present in the solution are sodium and sulfate ions.