The observation implies that the solubility of a solution depends on both the amount of solute and the volume of solvent.
Solubility
The solubility of a substance is the property of that substance to dissolve in a solvent.
The solubility of a solution is the ability of the solution to dissolve solutes.
Solubility depends on the quantity of solutes and solvents.
Thus, 100 mL water may be able to dissolve 35 g NaCl but not 70 g because the maximum solubility of the water is breached. In order to dissolve more NaCl, the volume of the water might need to be increased.
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