Expweriment for determination of melting point
Answers
Answer:
The melting point of a substance may be defined as the temperature at which the substance changes from the solid state to the liquid state.
Explanation:
Experiment
To determine the melting point of the given solid substance.
Requirements
100 ml beaker, thermometer, iron stand, clamp, tripod stand, stirrer, thin-walled capillary tube 8 to 10 cm long and 1 to 2 mm diameter, spatula. Liquid paraffin.
Procedure
1. Powder the crystalline substance. Take a capillary tube and seal its one end by heat¬ing (Fig. 3.1). For filling the substance make a heap of the powdered substance on the porous plate. Push the open end of the capillary tube into the heap. Some substance will enter into it. Now tap the sealed end of the capillary tube on the porous plate gently. Fill the capillary tube up to 2-3 mm.
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2. Attach the capillary tube to a thermometer which is immersed in a bath of liquid paraffin. The surface tension of the bath liquid is sufficient to hold the capillary tube in position.
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