The hardness of water is expressed in terms of:

Question

Question

This question was previously asked in

SSC CHSL Exam 2023 Tier-I Official Paper (Held On: 04 Aug, 2023 Shift 1)

Answer 1

The correct answer is ppm.

Key Points

The hardness of water is the measure of the concentration of dissolved minerals, primarily calcium and magnesium ions, in water.
The most common unit of measuring water hardness is parts per million (ppm).
Molarity is the measure of the concentration of a solution in terms of the number of moles of solute per liter of solution.
- It is not used to express water hardness.
Normality is a measure of the concentration of a solution in terms of the number of equivalents of solute per liter of solution.
- It is also not used to express water hardness.
A mole is the amount of a substance that contains the same number of particles as there are atoms in 12 grams of carbon-12. It is not used to express water hardness.

Additional Information

Mole: It is a unit of measurement used in chemistry to express amounts of a chemical substance. It is defined as the amount of a substance that contains the same number of particles as there are atoms in 12 grams of carbon-12.
Molarity: It is a measure of the concentration of a solution in terms of the number of moles of solute per liter of solution. It is commonly used in chemistry to express the concentration of a solution.
Normality: It is a measure of the concentration of a solution in terms of the number of equivalents of solute per liter of solution. It is commonly used in acid-base chemistry to express the concentration of an acid or a base.
Parts per million (ppm): It is a unit of measurement used to express the concentration of a substance in a solution. It is defined as the number of parts of a substance per one million parts of the solution. It is commonly used to express the concentration of minerals in water.