Hi,
This is a Lab work , when NaCl is added to CuSo4, the blue color of CuSo4 turned colorless. Does it indicate a chemical reaction has occurred or it is just a color change. There isn't a different color formed.
Another question NH3 is added to FeCl3, NH3 to CuSo4 The Color changes to Brown and a ring is formed , is there a precipitate (Precipitate settles to the bottom of the test tube).
thanks