Calculate the label concentration of the NaOH solution

Mar 2015
I've been stuck on this question for hours now, I dont really know where to start and I was wondering if you guys could help me out

The concentration of a solution of NaOH of unknown concentration was determined in the following titration:
25.00-mL aliquots of the NaOH solution, measured by pipette, were titrated with 0.1335 M H2SO4, requiring an average titre of 17.25 mL.

The acid, H2SO4, in solution reacted with the dissolved base, NaOH, in a stoichiometric mole ratio of 1 mol H2SO4 : 2 mol NaOH
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