How many grams of naoh must be dissolved in one litre of the solution to have a solution of ph 12?
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0.01 mol of OH- ion will obtain from 0.01 mol of NaOH.
Mass corresponding to 0.01 mol NaOH = number of moles x molar mass of NaOH.
= 0.01 mol x 40 g mol-1.
= 0.4 g
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