What happens when more solute is added to a fixed amount of solvent in a solution?
The concentration of the solution increases as more solute is added.
The concentration of a solution tells how much solute is present in a given amount of solvent or solution, for example the mass of solute in 100 g of solution, or the moles of solute per litre.
When the amount of solvent stays fixed and more solute is dissolved, the amount of solute rises while the solvent does not change. So the ratio of solute to solvent grows and the solution becomes more concentrated, as long as the extra solute still dissolves (up to saturation).
For example, stirring 5 g and then 10 g of salt into the same 100 g of water gives a saltier, more concentrated solution in the second case.
Adding solute can never turn a solution into a pure solvent, since a pure solvent contains no solute at all. The concentration cannot stay unchanged or become lower, because more solute is now present in the same solvent.
Hence, The concentration of the solution increases as more solute is added.
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