 Schweizer's reagent

model]] of the tetraamminediaquacopper (II) cation, [Cu(NH3)4(H2O)2]2+]]
Schweizer's reagent is the chemical complex tetraamminediaquacopper dihydroxide, [Cu(NH3)4(H2O)2](OH)2.It is prepared by precipitating copper(II) hydroxide from an aqueous solution of copper sulphate using sodium hydroxide or ammonia, then dissolving the precipitate in a solution of ammonia.