The pH of HCl is 1. The amount of NaOH to be added to 100 ml of such a HCl solution to get pH of 7 is

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0.4g

4 mg

0.4 mg

answer is B.

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Detailed Solution

for a neutral solution nH+=nOH-⇒ 10-1 x 100 x 10-3 = 10-2nNaOH = 10-2mNaOH= 40 x 10-2 g = 0.40 g

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