Q.

pH of a 10-10 M NaOH is nearest to

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a

10

b

slightly greater than 7

c

4

d

5

answer is B.

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Detailed Solution

As the solution is very dilute [OH-] of water also to be taken into considerationTotal conc. of OH- in solution= OH-(from  water)  +  OH(from  NaOH)= 10-7(approx)  +  10-10 = 10-71+0.001=1.001×10-7 pOH=-log1.001×10-7 =7-log1.001 =7-0.0004=6.999 pH=14-6.999=7.001,slightly greater than 7
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pH of a 10-10 M NaOH is nearest to