Explain the formation of scum when hard water is treated with soap. - Texcellency

Explain the formation of scum when hard water is treated with soap.

When hard water is treated with soap:

Soap reacts with minerals like calcium and magnesium in hard water.
This forms a sticky, insoluble substance called scum.
Scum sticks to surfaces, making cleaning difficult.
Scum also reduces the cleaning power of soap.

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