How you will determine the boiling point of water?
Answers
Answer:
Answer
i) Take around 100ml of water in a glass beaker and arrange it on a tripod stand with the burner below it.
ii) Suspend a thermometer in the beaker in such a way that the bulb is in contact with the water. A clamp stand could be used to hold the thermometer and shown in the diagram.
iii) Switch on the flame of the burner and keep checking the readings on the thermometer.
iv) Record the initial temperature when the water is just beginning to heat up.
v) Keep monitoring the temperature change in the thermometer while the water is heating up further.
vi) After a while, notice the vapours coming out of the boiling water. Record the temperature till half of the water has evaporated.
vii)Notice that the temperature in the thermometer will not rise above 100°C.
Answer:
The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).