Question

Determine the boiling point?
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Answer 1

Determine the boiling point?

• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.
• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.Transfer a few mL of benzene in the fusion tube.
• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.Transfer a few mL of benzene in the fusion tube.Dip the capillary tube into the liquid in the fusion tube keeping the sealed end up.
• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.Transfer a few mL of benzene in the fusion tube.Dip the capillary tube into the liquid in the fusion tube keeping the sealed end up.Insert the tube in one of the holes of aluminum block and insert the thermometer in the other hole.
• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.Transfer a few mL of benzene in the fusion tube.Dip the capillary tube into the liquid in the fusion tube keeping the sealed end up.Insert the tube in one of the holes of aluminum block and insert the thermometer in the other hole.Make sure that the liquid is visible in the fusion tube after it is put in the hole.
• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.Transfer a few mL of benzene in the fusion tube.Dip the capillary tube into the liquid in the fusion tube keeping the sealed end up.Insert the tube in one of the holes of aluminum block and insert the thermometer in the other hole.Make sure that the liquid is visible in the fusion tube after it is put in the hole.Place the Aluminium block on the tripod.
• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.Transfer a few mL of benzene in the fusion tube.Dip the capillary tube into the liquid in the fusion tube keeping the sealed end up.Insert the tube in one of the holes of aluminum block and insert the thermometer in the other hole.Make sure that the liquid is visible in the fusion tube after it is put in the hole.Place the Aluminium block on the tripod.Start heating the block with the help of kerosene burner.
• Take a capillary tube and close its one end by holding the end in the flame and rotate it for 2-3 minutes.Transfer a few mL of benzene in the fusion tube.Dip the capillary tube into the liquid in the fusion tube keeping the sealed end up.Insert the tube in one of the holes of aluminum block and insert the thermometer in the other hole.Make sure that the liquid is visible in the fusion tube after it is put in the hole.Place the Aluminium block on the tripod.Start heating the block with the help of kerosene burner.Note down the temperature soon as the regular streams of bubbles are seen out of liquid in the fusion tube.

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Answer 2

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The boiling point of a liquid may be defined as the temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure exerted upon the liquid surface.

The boiling point of the liquid depends upon the pressure exerted upon the liquid surface. Since atmospheric pressure is different at different place, therefore a liquid has different boiling points at different places. For the sake of comparison we use normal boiling points. The normal boiling point of a liquid may be defined as the temperature at which vapour pressure of the liquid is equal to one standard atmospheric pressure (760 mm).

The boiling point of a liquid increases if non-volatile impurities are present in it.