Using the USGS classification system a water with a total ha

Using the USGS classification system, a water with a total hardness of 170 mg/L as CaCO₃ is classified as?

a)

Soft

b)

Moderately hard

c)

Hard

d)

Very hard

Solution

USGS water hardness classification

Given hardness is 170 mg/L lies between 120 mg/L and 180 mg/L hence the water will be \"Hard\"

Option c) is correct