Question

describe an activity to determine the boiling point of water

Answer 1

Take about 25ml of distilled water in a boiling tube and add 2-3 small pieces of pumice stone.Close the mouth of the boiling tube with a rubber cork that has two bores and clamp it with the stand.Introduce a thermometer (temperature range -10 to 110°C) in one bore of the cork of the boiling tube. Keep the bulb of the thermometer  about 3-5 cm above the surface of the water.Then introduce one end of a delivery tube in the second bore of the cork.Place a 250ml beaker below the second end of the delivery tube to collect the condensed water.Heat the boiling tube gently, preferably by rotating the flame.Note the temperature (t1) when the water starts boiling.Continue to heat the water till the temperature becomes constant, and the water remains boiling. Note the constant temperature (t2).Record your observations in tabular form.