# How does calcium hydroxide react with ammonium chloride?

$C a {\left(O H\right)}_{2} \left(s\right) + 2 N {H}_{4} C l \left(a q\right) \rightarrow C a C {l}_{2} \left(a q\right) + 2 N {H}_{3} \left(a q\right) + 2 {H}_{2} O \left(l\right)$
And thus, treatment of calcium hydroxide with ammonium chloride should bring the calcium salt up into solution ($\text{calcium chloride}$ is pretty soluble).