Teach you the correct distinction between soft water and hard water

Teach you the correct distinction between soft water and hard water

        In daily life, the use of hard water will bring a lot of trouble to our lives and production. For example, if we wash clothes with hard water, soap is wasted and the washing is not clean. After a long time, the clothes will become hard, so how to distinguish between hard water And soft water?
         Soft water refers to water whose hardness is lower than 8 degrees. Water that contains no or less soluble calcium and magnesium compounds is called soft water. In natural water, rain and snow are soft water. Spring, stream, and river water are temporarily hard water, part of the groundwater is hard water, and distilled water is artificially processed soft water.
         Hard water refers to water containing more soluble calcium and magnesium compounds. Such as some well water, spring water. But there are almost none in the tap water. Hard water does not cause direct health hazards, but it will bring a lot of trouble to life, such as scale on water appliances, and reduced washing efficiency of soaps and detergents.
          1. Take a cup of hot water, pour in soapy water, and stir gently. The foam on the water surface is soft water, and the scum on the water surface is hard water. The more scum, the greater the hardness of the water.
          2. Use a beaker to heat, and it is hard water that leaves more scale on the cup wall. Because hard water is water that contains more soluble calcium and magnesium substances, after heating, these soluble calcium and magnesium substances are transformed into insoluble substances. Hard water has more precipitated impurities. The more impurities, the greater the hardness of the water.
          3. Take a clean, dry piece of glass. Drop an equal amount of water sample at different locations. After it evaporates completely, the white residue is hard water, and vice versa is soft water.