Chapter 6: Problem 31

What is meant by a universal indicator? State the colours given by a universal indicator to the solutions of following \(\mathrm{pH}\) values. (i) \(\mathrm{pH}=1\) (ii) \(\mathrm{pH}=8\) (iii) \(\mathrm{pH}=5\) (iv) \(\mathrm{pH}=12\)

Short Answer

Expert verified

Answer: A universal indicator shows the color red for a pH level of 1, green for a pH level of 8, yellow for a pH level of 5, and violet or blue for a pH level of 12.

Step by step solution

Definition of a Universal Indicator

A universal indicator is a mixture of different pH indicators that displays a range of colors across the pH scale from 0 to 14. The colors change as the acidity or basicity of a solution changes, which helps to indicate the pH level of the solution.

Color at pH = 1

At pH = 1, the solution is strongly acidic. A universal indicator shows the color red in such a solution.

Color at pH = 8

At pH = 8, the solution is slightly basic. A universal indicator shows the color green in a solution with this pH level.

Color at pH = 5

At pH = 5, the solution is somewhat acidic. A universal indicator shows the color yellow in a solution with this pH level.

Color at pH = 12

At pH = 12, the solution is strongly basic. A universal indicator shows the color violet or blue in a solution with this pH level.

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What is meant by a universal indicator? State the colours given by a universal indicator to the solutions of following \(\mathrm{pH}\) values. (i) \(\mathrm{pH}=1\) (ii) \(\mathrm{pH}=8\) (iii) \(\mathrm{pH}=5\) (iv) \(\mathrm{pH}=12\)

Short Answer

Step by step solution

Definition of a Universal Indicator

Color at pH = 1

Color at pH = 8

Color at pH = 5

Color at pH = 12

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