How to convert mg/l to meq/l:
In hydrological research, most of the time we need to convert the mg/l to meq/l. This milligram per litre is also a unit. The milliequivalent per litre is also a unit to measure the cation or anion concentration.
To know the milliequivalent we need to know, what is milliequivalent? This is the atomic mass divided by the valency.
suppose, Ca++ has a valency 2+
Ca++ atomic mass is 40.08 gm/mole
So milliequivalent is the 40.08(gm/mole)/2 (valency/mole)= 20.04 gm/equivalent
Now, 33 mg/L Ca++ need to convert to the milliequivalent/L
is simply devide by 20.04
Hence, 33/ 20.04 meq/L is the answer.