A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate
a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution.
Step 1. 0.001694g * 25ml * 1/155 g/mol= 0.0002732 mol
Step 2. Volume of EDTA needed = 0.0002732 mol/ 0.008640 M = 0.03125 or 31.25 mL
Having trouble with the next section.
b)The volume of 0.009450 M Zn2+ solution needed to titrate the excess reagent after the addition of 50.00 mL of the EDTA solution to a 25.00 mL aliquot of the Co2+ solution.
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I posted earlier how to solve this problem (the b part). Show your work
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