# How many grams of KNO_3 can be dissolved in water at 30°C?

This site reports a solubility of over $300 \cdot g \cdot {L}^{-} 1$ at laboratory temperature. The figure could be even more than this because the quoted value represents a $\text{saturated solution}$, and $\text{supersaturation}$, such that the solvent HOLDS more solute than would be in equilibrium with undissolved solute, is a real possibility.