Determination of Hardness in Water
Hardness of water is conventionally expressed in terms of equivalent amount of ____________
According to WHO, the soft water has 0 to _____ milligram per litre as CaCO3.
The difference between water that is hard and water that isn't is
Which of the following is not a unit of hardness?
1-degree Clarke = 1 part of CaCO3 per ____ parts of water.