1 Calcium solution

Question

2 Barium solution
3 Strontium solution
In which solution or solutions does not precipitate form when potassium ferro cyanide solution is added to the above solutions buffered with ammonia and ammonium chloride?

Answer 1

The best information I can find says that Ca is the only ion of the three that will ppt from NH3/NH4Cl buffered solution. The other two will not. I don't know from first hand experience.