2 g of acid was diluted with water in a volumetric flask to 200 ml. To 20 ml of this solution was added 20 ml of AgNO3 solution (TAgNO3 / Ag = 0.005394), the excess of AgNO3 was titrated with 10.50 ml of 0.05 N NH4SCN solution. What is the acid concentration?

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