Chlorine*
Chlorine does not make your pee turn blue it makes you have diaria
Why does copper sulfate change its colour when water is added
When water is added to anhydrous copper sulfate, it forms copper (II) sulfate pentahydrate, a blue crystalline solid. So, the color change observed is from white (anhydrous) to blue (pentahydrate) when water is added.
Blue, because the copper cations become hydrated and the hydrated ions have a blue color.
Anhydrous copper(II) sulphate is white. When added to water, it forms a solution of CuSO4(aq) which is blue because of the Cu2+ ion, which is itself a transition metal ion.
When litmus paper is added to calcium oxide and water, it will turn blue due to the formation of calcium hydroxide, which is a basic solution. Calcium oxide reacts with water to form calcium hydroxide, releasing heat in the process.
It entirely depends on what the blue solid is! If it's copper sulfate, the solid dissolves. If it's lapis lazuli, the solid sinks to the bottom. If it's small pieces of blue fibreglass, it will probably float.
Chlorine itself does not make water blue. The blue color in water can result from other factors such as the presence of certain minerals or algae. Chlorine is often added to water as a disinfectant to kill harmful bacteria and ensure its safety for consumption.
The blue copper (2) sulfate is undergoing a reversible reaction. When heated, it forms a white solid (copper (2) oxide) and water. When water is added to the white solid, it forms the original blue copper (2) sulfate, releasing heat, indicating an exothermic reaction.
This is because most likely, the indicator was a PH indicator, plain water has a neutral to low Ph indicated by blue. Whereas when vining air is added it increases the acidity of the solution as indicated by the pink color.
The light blue color of a solution of CuSO4 in water is due to absorption of yellow light by a coordination complex of water and copper cations. When NH3 is added, the water molecules in the coordination complex are replaced by ammonia molecules, and the resulting complex absorbs yellow light more strongly than the original one.
The copper sulfate reacts with the water, creating a new substance with a different color.