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Explain why calcuim ion makes water hard...

Explain why calcuim ion makes water hard, but sodium ion does not.

A

Calcium forms insoluble compounds with stearate ions present in soap

B

Sodium forms insoluble compounds with sterate ions present in soap

C

Calcium forms soluble compounds with stearte ion present in soap

D

Both calcium and sodium forms insoluble compound with sterate ions present in soap

Text Solution

Verified by Experts

The correct Answer is:
A
Calcium forms insoluble compounds with stearate ions present in the soap causing hardening of water
`Ca_((aq))^(2+)+2C_(17)H_(35)COO_((aq))^(-) to underset("(Insoluble precipitate)")((C_(17)H_(35)COO)_(2)Ca)`
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