Q.

10-6 M NaOH is diluted by 100 times. The pH of diluted base is

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a

Between 7 and 8

b

Between 6 and 7

c

Between 10 and 11

d

Between 5 and 6

answer is C.

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Detailed Solution

After dilution, OH- = 10-8 M

or   H+ = 10-6 M.  pH cannot be 6 because total

OH- = 10-7 + 10-8 = 10-7  1 + 0.1

 = 10-7 × 1.1  or H+  = 10-14/ 10-7   ×  1.1

 = 9.09 × 10-8 

   pH = 8 - log 9.09 = 8-0.9546 = 7.0454 

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