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Question: pH value of a solution, whose hydronium ion concentration is \(6.2 \times 10^{- 9}mol ⥂ / ⥂ l,\) is....

pH value of a solution, whose hydronium ion concentration is 6.2×10−9mol⥂/⥂l,6.2 \times 10^{- 9}mol ⥂ / ⥂ l, is.

A

6.21

B

7.21

C

7.75

D

8.21

Answer

8.21

Explanation

Solution

[H3O+]\lbrack H_{3}O^{+}\rbrack means [H+]=6.2×10−9mol/l\lbrack H^{+}\rbrack = 6.2 \times 10^{- 9}mol/l

pH=−log⁡(6.2×10−9)=8.21pH = - \log(6.2 \times 10^{- 9}) = 8.21.