The solvent will be the deionized water, the solute will be the AgNO3, and the solution is the substance that can test the presence of chlorine water.
A solvent is a liquid that can dissolve other substances
A solute is a solid capable of dissolving in relevant solvents
A solution is a mixture of solvent and dissolved solutes
In this case, the solvent that is capable of dissolving the solute is deionized water. The solute is the silver nitrate, while the solution would be a solution of silver nitrate.
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