Question

Toluene's boiling point is range from 100 to 116 C. and my unknow boiling range is 101 to 107 C

How do you tell if it's pure or not by determination of temperature range, and continuous drop rate?

Answer 1

Ans. As the boiling point of Toluene is 110 degree celsius. and the boiling point range of unknown is coming at the range of 101 to 107 degree celsius.

There are two possibilities

compound cannot be toluene as toluene boiling point is 110 degree celsius and also in the presence of impurities its boiling point should be increased not decreased.

Compound may be toluene but the thermometer is not calibrated and can show an error of 5 to 10 degree celsius. So. it is recommended to first calibrated the thermometer.