25.0cm3 of arsenic acid, H3AsO4, required 37.5cm3 of 0.100 mol/dm3 sodium hydroxide, NaOH, for neutralization

3NaOH (aq) + H3AsO4 (aq) - > Na3AsO4 (aq) + 3 H2O (1)

Find the concentration of the acid in g/dm3

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