Question

In experiment to demonstrate the boiling point of water. state reason for following

precautions.

a. The bulb of thermometer should not touch the sides of the beaker?

b. Pumice stone should be added while boiling water​

Answer 1

Hey mate,here is your answer

a) when you are heating on a under a flame or on a stove , the very bottom of the beaker is much hotter than the rest of the solution is not very well stirred . In such condition the temperature obtained on thermometer is wrong one because it's of beaker and solution , not just of solution .

b) pieces of pumice stone are added to water before heating to avoid bumping of liquid during the temperature increases . When water boils , it releases energy in the form of bubbles . Sometimes this bubbles formation do not take place due to which the water can super heat and may explode . Adding pieces of pumice stones gives lots of surface area for bubbles to form and release the energy easily without any bumping of boiling water .

I hope you like the answer...............!