7. A solution of calcium and magnesium salts was diluted with water to 100.0 ml. 18.45 ml of a 0.01020 M Trilon B solution was used to titrate a 20.00 ml aliquot with eriochrome black T; 8.22 ml of Trilon B was used to titrate the same aliquot with murexide. What mass of Ca and Mg was contained in the initial solution?
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