Traditional Culture Encyclopedia - Tourist attractions - When Xiaolan was traveling in the mountainous area, she found that washing clothes with the clear river water there had little foam and poor decontamination ability. Please explain why.

When Xiaolan was traveling in the mountainous area, she found that washing clothes with the clear river water there had little foam and poor decontamination ability. Please explain why.

Because the mountain water is hard, that is, it is rich in soluble calcium and magnesium compounds, which can react with soap, thus reducing the foaming ability and decontamination ability of soap.