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Question

The hydroxide ion concentration of a solution is 1.0×109 M. What is the pH of this solution?


A

3

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B

4

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C

5

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D

6

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Solution

The correct option is C

5


pOH = log10[OH]

Therefore, according to the information given in the question,

pOH = log10(1.0×109)

pOH = 9

pH = 14 – pOH

pH = 14 – 9 = 5

As, pH <7, so , the solution is acidic in nature.


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