Question

an experiment to show the colour change during a chemical change​

Answer 1

Answer:

pH indicators are extremely useful for color change chemical reactions. For example, you can use phenolphthalein indicator to make water appear to turn into blood or wine and back to water (clear - red - clear).

This simple color change demonstration is perfect for Halloween or Easter.

Turn Water into Blood or Wine

Answer 2

Experiment to show the colour change during a chemical change​:

A universal indicator is phenolphthalein, it indicates the changes of colour and shows the pH of certain solutions. In acidic solution, Phenolphthalein stays colorless but in alkaline solutions, it turns pink. If you add phenolphthalein to a base sodium hydroxide, the solution becomes pink.

• A colour change can be an indication of an occurrence of a chemical reaction. Rusting metal over time and changing its colour to orange is another example of a chemical reaction.