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Question
Five solutions, A, B, C, D and E, when tested with universal indicator, showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is
- neutral?
- strongly alkaline?
- strongly acidic?
- weakly acidic?
- weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
Solution
- Neutral → Solution D with pH 7.
- Strongly alkaline → Solution C with pH 11.
- Strongly acidic → Solution B with pH 1.
- Weakly acidic → Solution A with pH 4.
- Weakly alkaline → Solution E with pH 9.
The pH can be arranged in the increasing order of the concentration of hydrogen ions as pH = 11 < pH = 9 < pH = 7 < pH = 4 < pH = 1.
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| A | 1 |
| B | 5 |
| C | 7 |
| D | 11 |
| E | 13 |
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| A | 1 |
| B | 5 |
| C | 7 |
| D | 11 |
| E | 13 |
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