Determination Of The Hardness Of Water Water Page 4
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1
2
3
42+
Again, because the reaction between EDTA and Ca
is 1:1 and the formula weight of CaCO
is
3
100.0 g/mole, the hardness of water in a 50.00 mL sample, in ppm of CaCO
, is simply the
3
(class average) molarity of EDTA times the volume titrated (in mL) times 2000. Calculate the
hardness of each sample.
In the laboratory, we will calculate the class average of the water hardness (ppm) and
demonstrate indeterminate error with a statistical analysis of the data. In particular, we will
calculate the estimate of standard deviation, s:
∑
2
d
i
s
=
−
N 1
Σ
Where:
means “the sum of”
d
= | x
– x |
i
i
N = number of measurements
x = average of the i measurements
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