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| In daily life, we often see the kettle with long wall will have the scale generation. What is the reason that we used in the water contains a lot of inorganic salts, such as calcium, magnesium salts, etc.. Water salt at room temperature the naked eye can not be found, once they are boiling hot, there are a lot of salts of calcium and magnesium carbonate to form precipitate, they cling to the wall of the kettle on the formation of scale. We usually put calcium and magnesium ions in water with "hardness" to express this indicator. Hardness 1 degrees equal to every liter of water containing 10 mg of calcium oxide. Less than 8 of the water is called soft water, higher than 17 degrees is called hard water, between 8 to 17 degrees is called moderate hard. Rain, snow, river, river, lake water is soft water, spring water, deep well water, water is hard water. Look at the difference between softened water and other water. Raw water, refers to the water has not been treated. In a broad sense, the water before entering the water treatment process is also known as the raw water of the water treatment. For example, water from a water source into a clarifier is called raw water. Softened water, refers to the hardness of water (mainly refers to the water calcium, magnesium ions) to remove or reduce a certain degree of water. In the process of softening, only the hardness decreases, while the total salt content remains unchanged. Demineralized water, refers to the water salt (mainly soluble in water strong electrolyte) to remove or reduce to a certain degree of water. The electrical conductivity is 1 ~ 10 S/cm resistivity (25 C) (0.1 ~ 1) * 106 Omega, cm, salt content is 1 ~ 5mg/L. Pure water, refers to the water of strong electrolyte and weak electrolyte (such as SiO2, CO2, etc.), remove or reduce to a certain degree of water. The conductivity of general: 1 ~ 0.1 S/cm, electrical conductivity (1.01.0 ~ 10) * 106 Omega, cm. Salt content is <1mg/L. Ultra pure water, refers to the water medium almost completely removed, while not dissociating gas, colloid and organic substances (including bacteria, etc.) also removed to a very low degree of water. The electrical conductivity is 0.1 ~ 0.055 S/cm, resistivity (25 DEG C) > 10 * 106 Omega, cm, salt content was less than 0.1 mg/L. The pure water (Theory) for 0.05 S/cm conductivity, resistivity (25 C) 18.3 * 106 Omega, cm. [ Previous] [Next] [Return] |
