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A water sample has a pH of 9.25. The concentration of hydroxyl ions in the water sample is
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- 10–9.25 moles/l
- 10–4.75 moles/l
- 0.302 mg/l
- 3.020 mg/l
Correct Option: C
pH = –log[H+]
9.25 = –log[H+]
∴ [H+] = 10–9.25 mol/l
[H+ ][OH-] = 10-14
| [OH-] = | = 10-4.75mol/l | |
| 10-9.25 |
= 10–4.75 × 17 × 1000
= 0.302 mg/l.
