In daily life, the use of hard water will bring a lot of trouble to our life and production, for example, if in hard water washing, waste of soap, and also wash not clean, time grew, clothes also can harden, so how to distinguish between the hard water and soft water?
First of all, we need to look at what is hard water and soft water.
Hard water, contain more soluble calcium and magnesium compound; And soft water contains no or less soluble calcium and magnesium compounds.
Distinguish between methods:
Take two cups of water and soap water to join the two cups of water, oscillation. Then observe bubble in two glasses of water. Generating dross more is hard water, on the contrary, another cup is soft water.