1.prepare this solution of copper(II) hydroxide prior to the demonstration
a.place about 125ml of water in a 500ml beaker.
b.Add copper sulfate and stir until the solution is saturated.
c.With constant stirring , add concentrated aqueous ammonia drop by until a blue-green color appears and a precipitate forms. Do not add too much aqueous ammonia. If the solution becomes dark blue,start again.