40. Solving a chemistry problem
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154. Calculate the mass of barium chloride (BaCl2) contained in 250 ml of its solution, if after adding 40.00 ml of 0.1020 M nitrate solution to 25.00 ml of this solution, the silver residue AgNO3 was titrated with 15.00 ml of 0.09800 M solution ammonium thiocyanate (NH4SCN).
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