How do we produce a stoichiometrically balanced equation for the formation of #BaSO_4#?
You balance it stoichiometrically.
And stoichiometry INSISTS that charge be balanced, AND mass be balanced. Experiment tells us that barium sulfate is insoluble in aqueous solution.
The water solvate on the barium chloride is along for the ride in aqueous solution.
We could write the net ionic equation as follows:
If you need further help working out the gram solubility from