Question

The substance that changes the colour of red litmus paper into blue colour A. sodium chloride solution B. lemon juice C. pure water D. sodium hydroxide solution​

Answer 1

A. sodium chloride

Explanation:

Hope it helps you

Answer 2

Answer:

The answer will be D) Sodium hydroxide solution

It is a base and he base turns red litmus into the blue. Thus Sodium hydroxide turns red litmus into the blue.

Explanation:

Litmus paper is used to test the pH balance of a liquid or substance. Most substances are either alkali or acid. Alkaline, or basic, chemicals include baking soda, ammonia and lye.

Acidic substances include vinegar, lemon juice and battery acid. Alkalies and acids are at opposite extremes chemically, and will cancel each other out to form a neutral substance when mixed together at equal strengths.

When red litmus paper is placed into a basic substance, it will turn blue. If it comes in contact with an acidic or neutral substance, it will remain red. Red litmus paper is meant to test only for an alkaline pH level