In: Civil Engineering
Given, concentration of
in water = 36.6 mg/L
We know that, hardness is due to the presence of multivalent
cations in water and its total concentration will give the hardness
of water.
is one such cation.
Therefore,
Hardness of water = concentration of
But, we are asked to determine this in terms of mg/L of
This shall be done as follows:
Or
To avoid lengthy calculations we can just multiply given
concentration of
by a factor of 4.1 to convert it in terms of
.
Hence, hardness of water = 150.62 mg/L as CaCO3.