how does soap behave with hard water?
Answers
Answer:
Soaps are sodium or potassium salts of long chain fatty acids. When soap is added to hard water, the Ca2+ and Mg2+ ions present in hard water react with soap. The sodium salts present in soaps are converted to their corresponding calcium and magnesium salts which are precipitated as scum. The insoluble scum sticks on the clothes and so the cleaning capacity of soap is reduced.
Ca2+ + 2RCOO-Na+ → (RCOO)2Ca + 2Na+
Mg2+ + 2RCOO-Na+ → (RCOO)2Mg + 2Na+
The salt of Ca and Mg is called as SCUM.
PLEASE MARK BRAINLIEST
Answer:
when soap is added to hard water,the Ca2+and Mg2+ions present in hard water react with soap. The sodium salts present in soaps are converted to their corresponding calcium and magnesium salts are precipitated as scum.The insoluble scum sticks on the clothes and so the cleaning capacity of soap is reduced.