You are given two samples of water labelled as ‘An’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of water will not freeze at 0°C? Comment.

Question

You are given two samples of water labelled as ‘An’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of water will not freeze at 0°C? Comment.

Philoid · Accepted Answer

Sample ‘B’ will not freeze at 0°C because it is not pure water. It must have contained impurities. At 1 atm, the boiling point of pure water is 100°C and the freezing point of pure water is 0°C. The only pure substance has such sharp melting point.