20. Solution to Chemistry Problem

74. A metal was precipitated from a salt solution (see the table for options) as an oxyquinolate, the precipitate was filtered, washed and dissolved in HCl; the precipitate released in the oxidizer after adding KBr was titrated with a KBrO3 solution with a methyl red indicator (in fact, the titrator is Br2 as a product of the interaction of KBrO3 and KBr). Calculate the concentration (mol/l and g/ml) of the metal salt solution if V (ml) of 0.1085 N KBrO3 solution was spent on titrating 25.00 ml of the analyzed solution (T(KBrO3) = 1.96).

| Option | Salt formula | n(Br2) per metal atom | V (titrant), ml |
5 CuSO4 4 21.84