The degree of hardness of water is usually expressed in terms of

Define degree of hardness of water.

Degree of liness of water is expressed in terms of ppm of

How can the hardness of water be expressed?

The wavelength of light is usually expressed in

Degree of hardness is expressed by

Degree of hardness of a water sample is 100ppm. 50 ml of standard soap solution is added to one kilogram of hard water sample. Calculate the degree of hardness of the resulting water sample. (one ml of soap solution is 0.001 g CaCO_3 ).