Question

Copper sulphate solution turns the colour of litmus into red but litmus changes into blue with baking soda solution although both are salts. Why?

Answer 1

Note:- Baking soda isn't salt really.

Note- Copper has sulphur. When you mix sulphur with water, it becomes acid, non metals become acids when mixed with water.

Copper sulphate has some acids[sulphur] so, it turns blue litmus to red

Baking soda, or sodium bicarbonate, is a basic solution, so it turns red litmus blue

I hope this will help. This answer is of my understanding about acids, bases and salts, don't report this answer.

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