calculating volume of EDTA
(i) the volume of 0.08640 M EDTA needed to titrate a 25.00-mL aliquot of this solution.
(ii) the volume of 0.009450 M Zn2+ needed to titrate the excess reagent after addition of 50.00 mL of 0.008640 M EDTA to a 25.00-mL aliquot of this solution.
(iii) the volume of 0.008640 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 CoSO4solution.
The reaction is Co2+ + ZnY2- CoY2- + Zn2+
Homework Answers
The following data is provided:
Mass of cobalt sulfate present in the 
Molar mass cobalt 
a) Volume of the aliquot of the solution of cobalt 
Molarity of the 
Volume of the EDTA needed to titrate the cobalt sulfate 
The reaction of the titration is taking place as follows:
Mass of the copper sulfate is
.
Number of moles of cobalt 
Therefore, 
of cobalt sulfate are present in
.
So, the moles of copper sulfate present in 
aliquot will be
Hence 
of cobalt sulfate are present in 
solution.
To calculate the volume of EDTA required to titrate the above solution.
As, 
, that is equal moles of cobalt sulfate require equal moles of EDTA.
Therefore, 
of EDTA are present. Molarity of the EDTA solution is 
.
So
In the above equation molarity of EDTA and moles of EDTA are known and so the volume of EDTA can be calculated rearranging the equation:
Therefore, the volume of EDTA required to titrate the solution is
.
b) Let 
be the number of moles EDTA.
Molarity of EDTA is 
, Volume of EDTA is 
or 
Calculate number moles of EDTA presented in solution as given below:
Moles of EDTA present in 
is 
.
Calculate number of moles of EDTA present in 
sample as shown below:
Calculate the excess number of moles of EDTA present as given below:
Moles of zinc that react with EDTA are 
.
Therefore, for calculate volume of zinc solution 
as given below:
As,
So,
Therefore, the volume of the zinc solution required is
.
c) Molarity of 
The following reaction is taking place:
Therefore, equal moles of zinc are required to react with EDTA as of Cobalt.
Moles of zinc required is same as moles of cobalt present in the sample that is 
. Thus, 
of zinc are present in 
aliquot.
Therefore,
So, 
of EDTA are required to react with zinc. Calculate the volume of EDTA required as given below:
As,
So
Therefore, 
is required.
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