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CBSE Class 10 Answered

describe what is universal indicator and what is the significance of it?
Asked by | 24 Jun, 2008, 08:03: PM
answered-by-expert Expert Answer

Universal indicator is a pH indicator that transitions through numbers 3-12 (on the pH chart) to indicate the acidity or alkalinity of solutions.

  Details:

  • pH value: Approximately 7

A universal indicator is typically composed of water, methanol, propan-1-ol, phenolphthalein sodium salt, methyl red sodium salt, bromothymol blue monosodium salt, and thymol blue monosodium salt .

Here are the colours that indicate the acidity of a solution, after adding UI:

1. Very acidic - Red

2. Acidic - Orange/Yellow

3. Neutral - Green

4. Basic/base/alkali - Blue

5. Very basic/base/alkali - Purple

Answered by | 04 Jul, 2008, 03:10: PM

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