I did a lab report on Physical Properties, Melting Points and Boiling Points. Fo

Question

I did a lab report on Physical Properties, Melting Points and Boiling Points.

For the Melting Portion This required using an SMP 10 melting point apparatus, or a MEL TEMP melting point apparatus.

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For the Boiling Portion, this required suspending a capillary tube over a sand bath, and have a thermometer positioned about 0.2 inches over the liquid in the capillary tube.

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What are some potential errors in the procedure in a typical expiriment like this.

Explanation / Answer

part a Melting point experiment

1. Most of the errors arise dure to quick heating. Always heating rate should be kept at 1 to 2 degree cesius per minute.

2. The sample must be totally dried before experiment an any residual liquid can lead to errors in melting temperature obervations.

3. Apporpriate calibration should be done before conducting the experiment.

Part b Cappliary tube method

In this method a few crystals of the compound are placed in a thinwalled capillary tube 10-15 cm long, about 1 mm in inside diameter, and closed at one end. The capillary, which contains the sample, and a thermometer are then suspended so they can be heated slowly and evenly. Plateau is reached at the boiling point.

1. In this case also heating rate must be controlled for accurate observations.

2. The thermometer must be in the contact of liquid surface not is the air.

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