A solution contains 1.569 mg of CoSO4 (155.0 g/ mol) per milliliter. Calculate
(a) the volume of 0.007840 M EDTA needed to titrate a 25.00-mL aliquot of this solution.
(b) the volume of 0.009275 M Zn2+ needed to titrate the excess reagent after addition of 50.00 mL of
0.007840 M EDTA to a 25.00-mL aliquot of this solution.
(c) the volume of 0.007840 M EDTA needed to titrate the Zn2+ displaced by Co2+ following addition of an
unmeasured excess of ZnY2- to a 25.00-mL aliquot of the CoSO4 solution. The reaction is
Co2+ + ZnY2- → CoY2- + Zn2+
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