Question

Describe an activity to determine the boiling point of water

Answer 1

The Procedure:
Real Lab Procedure:
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.
Note: Pieces of pumice stone are added to water before heating to avoid bumping of liquid when the temperature rises. When water boils it releases energy as bubbles. If the bubbles do not form, the water can super heat and possibly explode. This could happen if the container is very clean and there is no means for the formation of bubbles. Adding pieces of rough stone gives lots of surface area for bubbles to form and release the energy gradually.

Answer 2

1. Take a beaker and fill half of the beaker with water .
2. Keep it under the bunsen burner above the wire gauze.
3. Place the laboratory thermometer in it.
4. You will see the mercury remains constant.
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