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Question
Explain, why a universal indicator is preferred to acid-base indicators.
Solution
Universal indicators are preferred to acid-base indicators because these give different colours in different PH ranges. A solution containing a drop of universal indicator is matched against a standard colour to find the PH of the solution.
| PH | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Colour of universal inducator | Red | Pink | Yellow | Green | Blue | Indigo | Violet |
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