# What is the solubility of potassium nitrate in water? And how is "solubility" defined?

$\text{Solubility}$ $=$ $\text{Moles (or mass) of solute"/"Volume of solution}$
Typically we report a solubility in $m o l \cdot {L}^{-} 1$ or $g \cdot {L}^{-} 1$, and nitrate salts are exceptionally soluble. This site reports a solubility of $316 \cdot g \cdot {L}^{-} 1$ at $20$ ""^@C.