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How is hardness classified in water?
In the process of water heating, some metal ions in the water will form scale attached to the heating surface due to evaporation and concentration, and these ion concentrations are called hardness. For natural water, these ions are mainly calcium and magnesium ions, other ions such as iron, manganese, zinc ions will also form hardness, but because these ions in natural water content is very small, can be ignored. So the hardness of water is the total concentration of magnesium ions in the water. So how do you classify hardness in water?
Water hardness can be divided into carbonate hardness (also known as "temporary hard") and non-carbonate hardness (also known as "permanent hard").
(1) Carbonate hardness: This kind of hardness is mainly calcium, magnesium ion bicarbonate. This hardness is called "temporary hardness" because it forms a precipitate when heated and precipitates out of the water.
(2) Non-carbonate hardness: This hardness is mainly calcium, magnesium ions of sulfate and chloride. Because they cannot be heated to precipitate from water, they are called "permanent hardness".
The above is the hardness of the water classification, if you have other questions, you can leave a message at the end of the article, Xiaobian will reply to you in time!
