Base changes the colour of the red litmus to ______.

The correct answer is Blue.

• The colour of red litmus paper turns blue when it reacts with base.

Key Points

• The base is a chemical substance that donates electrons, accepts protons, or releases hydroxide (OH^-) ions in aqueous solution.
• It tastes bitter and changes the colour of red litmus into blue. It reacts with acids to form salts.
• Phenolphthalein changes from colourless to pink in the presence of a basic solution.
• Litmus paper is a paper that is treated with a specific indicator which is a mixture of 10 to 15 natural dyes obtained from lichens.
• It is helpful in determining whether the solution is acidic or basic.

Additional Information