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Importance of determination of Hardness and Alkalinity of water 

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With rise in the requirement of water for industrial, agricultural, and domestic consumption, resources are being used and re-used more than ever before. Being an essential part of life, the water quality should be checked and maintained for the purpose for which it is intended. Water quality check includes wide array of chemical and physical parameters. Hardness and alkalinity are considered as basic and important factors affecting the water quality. Hence the measurement of these parameters is a key factor in water treatment processes. 

Hardness of Water

Hardness of the water is the amount of mineral content present in the water. It is generally a measurement of divalent cations, mainly Calcium and Magnesium. When water flows through rivers and streams, it absorbs mineral content from rocks and soil before reaching to the supply. Generally, bicarbonates, sulphates and chlorides of calcium and magnesium contribute to the hardness of water. Hardness is measured in terms of ppm or mg/L. 

Hardness of water is subdivided into two types – Temporary hardness and permanent hardness. Temporary hardness (also known as alkaline hardness) is the part of total hardness which can be removed by boiling. It mainly contains bicarbonates and carbonates of calcium and magnesium. The hardness which remains even after boiling is called as permanent hardness or non-alkaline hardness. It consists of sulphates and chlorides of calcium and magnesium. 

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