21. What mass of BaCl2*2H2O was dissolved in 250.0 cm3 of solution, if after adding 40.00 cm3 of 0.1020 M AgNO3 to 25.00 cm3 of it, 15.00 cm3 of 0.09800 M KSCN was used for back titration of excess AgNO3?
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