First slide

Hardness of water

Question

Statement I: Hard water does not give lather with soap
Statement II : In hard water, the sodium stearate of soap changes to the corresponding calcium magnesium salt which precipitates out

Easy

A

Statement I and Statement II are true.
B

Statement I is true and statement II is false.
C

Statement I is false and Statement II is true.
D

Statement I and Statement II are false.

Solution

The hard water does not gives lather with soap solution, due to the presence of ↑ soluble Ca & Mg salts
Those are Mg(HCO₃)₂ MgCO₃
Ca(HCO₃)₂ CaCO₃
The sodium stearate of soap reacts with these salts and converting into insoluble (PPT) calcium and magnesium stearate.

Statement I and Statement II are true.

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