Aluminum Nitrate

Aluminum Nitrate (Al(NO₃)₃.9H₂O), molecular mass; 212.996 g/mol,density 1.72 g/cm3 , melting point 66 °C. 
Aluminum Nitrate a hydrated white crystalline solid prepared by dissolving freshly prepared aluminum hydroxide in nitric acid. It cannot be prepared by the action of dilute nitric acid on aluminum since the metal is rendered passive by a thin surface layer of oxide.