Answer to Question #289181 in General Chemistry for earl

Question

Answer to Question #243834 in General Chemistry for Megan

A solution contains 1.569mg of CoSO4(155.0g/mol)per mL. Calculate

a) the volume of 0.007840M EDTA needed to titrated a 25.00mL aliquot of this solution

Answer 1

Mass of sulfate = 0.0001569g

Sulfate = mass/molar mass

Number of moles of cobalt = 0.0001569g/155

=0.00000101mol/ml

25× 0.00000101= 0.00002525mol.

And Volume = 0.00002525 × 1000 / 0.007840

= 0.0019796 litre .

Volume = 2 ml .