Question

Hardness of water is expressed in terms of ppm of sodium carbonate. If this is true enter $1$ , if false enter $0$ .

Answer 1

We must remember that the water is one of the most important things in our daily life. The molecular formula of water is ${H_2}O$ . On earth $75\%$ is covered with water. In our body $65\%$ contains water only. Water has two hydrogen atoms and one oxygen atom; these are bound by a covalent bond. In nature, water is a colorless and less volatile liquid.

Complete step by step answer:
Given statement:
The hardness of water is expressed in terms of ppm of sodium carbonate.
We need to know that in general, water is classified into two types. One is soft water and another one is hard water. This classification is based on the presence of a high amount of mineral ions content. Such mineral ions are majorly magnesium and calcium ions. These metals are in the form of bicarbonate, chlorine or sulfate in water, that reason water became hard.
Boiling of this hard water, these salts are precipitated from water. Now water became free from salts of calcium and magnesium, this water is called soft water.
We must know that the calcium carbonate salt is used to express the hardness of the water in terms of ppm.
We must know that the hardness of water is expressed in various alternative units, by using the equivalent mass of calcium carbonate or calcium oxide content dissolved in a unit volume of the pure form of water. This equivalent mass is the same as the total number of magnesium and calcium ions present in water. Sometimes, different conversion factors arise and differ from equivalent masses of calcium carbonates and calcium oxide in water. As those factors are molecular mass and volume of the calcium carbonates and calcium oxides are different. Usually ppm is used to represent the hardness of the water. Parts per million are shortly represented as ppm. It is defined as $1mg{L^{ - 1}}$ means one milligram of calcium carbonates is dissolved in one liter of water.
From the above discussion, we know that the hardness of water is expressed in terms of ppm of calcium carbonate and not able to represent in ppm of sodium carbonate.
Hence, the given statement is false.

Note: We must remember that the water has an intermolecular hydrogen bond between the molecules. This bonding causes water to have high boiling and melting point. We must remember that the hardness in water is classified as temporary and permanent hardness. The reason for the permanent hardness of water removal is difficult. Temporary hardness removal is an easy one.