1.

Why soap is not suitable for washing clothes with hard water? 

Answer»

Soap reacts with calcium and magnesium ions in water to form insoluble precipitates, which is known as scum. Scum sticks to clothes and Interferes with cleaning ability of soap. 

 RCOONa+ Ca2+ or Mg2 (RCOO)2 Mg or (RCOO)2 Ca 



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