How will you distinguish calcium nitrate and zinc nitrate solution?

When ammonium hydroxide (NH₄OH) is added to zinc nitrate solution [Zn(NO₃)₂], a gelatinous white ppt of zinc hydroxide [Zn(OH)₂] is obtained which is soluble in excess of NH₄OH.

$\underset{\text{colourless solution}}{{\text{ZnSO}$4}} + 2\text{NH}4\text{OH} \longrightarrow \underset{\text{white gelatinous ppt}}{\text{Zn(OH)}2↓} + \underset{\text{colourless in solution}}{(\text{NH}4)2\text{SO}4}

(With excess NH₄OH ppt. dissolves)

$\text{Zn(OH)}$2 + (\text{NH}4)2\text{SO}4 + 2\text{NH}4\text{OH} \longrightarrow \underset{\underset{\text{zinc (II) sulphate}}{\text{Tetraammine}}}{[(\text{Zn(NH}3)4]\text{SO}4} + 4\text{H}_2\text{O}

On the other hand, calcium nitrate solution [Ca(NO₃)₂] does not give any ppt. even when excess of ammonium hydroxide is added.