Boiling and Melting

What is the boiling point of a liquid and melting point of a solid? 

The boiling point is the temperature at which a liquid changes to the vapour state at atmospheric pressure. The melting point is the temperature at which a solid changes to a liquid at atmospheric pressure.

The aim of this experiment is to determine the boiling point of water and melting point of ice. 

The apparatus and chemicals required for this experiment are: 

Round bottom flask, Retort stand, Water, Crushed ice, Double-bored cork, Beaker, Thermometer, Burner, Tripod stand, Wire gauze, Glass tube 

The procedure followed for this experiment will be: 

A. Determination of boiling point of water

1. Observe the least count and range of the thermometer.
2. In a round bottom flask, take about 150 mL of water. 
3. Fit the round bottom flask onto the retort stand, placed over the wire gauze and tripod stand. 
4. Stopper the flask with a double-bored cork and insert the thermometer and glass tube through it.
5. Make sure that the bulb of the thermometer is above the water level.
6. Heat the water and note the temperature at which it starts boiling until it boils continuously.  

B. Determination of the melting point of ice.

1. Take a beaker and fill it half with ice. 
2. Insert the thermometer into the beaker. 
3. Note the temperature at which the solid starts to melt until all the solid has melted. 

Hence, it can be concluded that, 

1. The boiling point of water is found to be 100 ⁰C. 
2. The melting point of ice is found to be 0 ⁰C. 

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