To make a solution of pH = 12, the amount of NaOH dissolved in one liter of the solution should be

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0.1 g

0.2 g

0.4 g

1.2 g

answer is C.

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Detailed Solution

pH = 12 ; POH =14-12= 2or OH-=10-2 Mor NaOH=10-2 moles/lit No. moles(n) =wGmw W=10-2× 40 = 0.4 g L-1

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