Question

Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

Answer 1

Litmus

• Litmus is the most commonly used natural indicator.
• The purple dye used in the litmus solution is taken from lichen.
• Acids are sour in taste and change the colour of blue litmus to red.
• Bases are bitter and change the colour of the red litmus to blue.

Blue litmus paper remains blue in solution

• If the colour of the blue litmus remains the same in the solution, the solution is not acidic.
• The nature of the solution may be basic or neutral.

So, the nature of the solution may be basic or neutral.