Water Sources, Types, and Hardness

Temporary hardness (in mg/L as CaCO3) = (Chemical equivalent x producing hardness) / Strength of substance (correct)

Temporary hardness (in mg/L as CaCO3) = Strength of substance / (Chemical equivalent x producing hardness)

Temporary hardness (in mg/L as CaCO3) = Chemical equivalent x producing hardness x Strength of substance

Temporary hardness (in mg/L as CaCO3) = Chemical equivalent / (Strength of substance x producing hardness)

1 PPM = 1 Degree French

1 PPM = 0.5 Degree French

1 PPM = 0.07 Degree French

1 PPM = 0.1 Degree French (correct)

Total permanent hardness (in mg/L as CaCO3) = Permanent magnesium hardness / Permanent calcium hardness

Total permanent hardness (in mg/L as CaCO3) = 2 * Permanent magnesium hardness

Total permanent hardness (in mg/L as CaCO3) = Permanent magnesium hardness + Permanent calcium hardness (correct)

Total permanent hardness (in mg/L as CaCO3) = Permanent magnesium hardness - Permanent calcium hardness

<p>Milligrams per liter (mg/l)</p> Signup and view all the answers

<p>$Chemical equivalent$ = $\frac{Atomic weight}{Valence}$</p> Signup and view all the answers