What would occur if the volume of solvent decreases during solubility measurement?

When the volume of solvent decreases during a solubility measurement, the concentration of the solute in the remaining solvent increases. This happens because solubility is typically defined as the maximum amount of solute that can dissolve in a given volume of solvent at a specific temperature. If the volume of solvent is reduced without changing the amount of solute, the calculated solubility will reflect a higher concentration of solute relative to the lesser volume of solvent.

Thus, the solubility value will appear too high, because it is based on a smaller denominator (the decreased volume of solvent) for the same amount of solute. Hence, despite having the same amount of dissolved solute, the reported solubility measurement will not accurately reflect the solubility characteristics of the substance under standard conditions.

To summarize, decreasing the solvent volume skews the measured solubility value upward, leading to an inaccurate (and too high) representation of the solubility of the substance in question.