Hardness Of Water By Edta Titration Worksheet Page 3
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3Chemistry 201 Laboratory
Page 3 of 3
Informal report
Date submitted___________
Experiment: Hardness of Water by EDTA Titration
Time submitted___________
Name_____________________
Values Obtained:
Locker #___________________
(1)_________ppm CaCO
3
(2)_________ppm CaCO
3
(3)_________ppm CaCO
3
Average value____________
Std Deviation_____________
Weight of calcium carbonate (by differences) _____(g)
Molarity of your standard calcium solution _________(M)
Standardization Titration for EDTA solution
I
II
III
Buret reading at start of titration (mL)
___
___
___
Buret reading at end of titration (mL)
___
___
___
Volume of EDTA solution used (mL)
___
___
___
Molarity of EDTA (M)
___
___
___
Average molarity of EDTA _______(M)
Titration of Unknown Sample
Buret reading at start of titration (mL)
___
___
___
Buret reading at end of titration (mL)
___
___
___
Volume of EDTA solution used (mL)
___
___
___
Concentration of calcium carbonate in unknown
___
___
___
Sample calculations: FW of CaCO
= 100.09 g/mol = 100.09 mg/mmol; 1 ppm = 1 mg/L
3
Let’s say you titrate 25 mL of unknown:
100
.
09
mg
(
M
)(
V
in
mL
)(
)
ppm CaCO
=
EDTA
e
3
mmol
1
L
(
25
mL
of
ukn
)(
)
10
mL
3
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