# What is the dissolution reaction for KNO_3. How many moles of ions are formed from it?

Dissolution: $K N {O}_{3} \left(s\right) \to {K}^{+} \left(a q\right) + N {O}_{3}^{-} \left(a q\right)$
Observe that per mole of $K N {O}_{3}$, 1 mole each of potassium ions (${K}^{+}$) and nitrate ions ($N {O}_{3}^{-}$). Therefore, as a whole, this dissolution reaction will produce 2 moles of ions, being unspecific of species.