17. An alkali weighing 0.5341 g containing 92% NaOH and 8% indifferent impurities was dissolved and brought to the mark in a volumetric flask with a capacity of 100.0 ml. Determine the molar concentration of the acid, T(HCl) and T(HCl/NaOH), if 19.50 ml of acid was used to titrate 15.00 ml of NaOH solution.

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