How do you determine the boiling point of an unknown liquid?

How do you measure the boiling point of a liquid?


  1. Take a small test tube and fill it two-third with the given liquid whose boiling point is to be determined. …
  2. Clamp the thermometer carrying test tube in an iron stand through a cork. …
  3. Take a capillary tube 5-6 cm in length and seal it at about one cm from one end by heating it in flame and giving a slight twist.

What is most useful for identifying an unknown liquid?

When observing different liquids, the way a liquid acts on paper is a characteristic property of the liquid and can be used to identify it. For the test to be fair, the same amount of each liquid should be placed on the paper in the same way.

How do you determine the melting point of an unknown substance?

The melting point of an organic solid can be determined by introducing a tiny amount into a small capillary tube, attaching this to the stem of a thermometer centred in a heating bath, heating the bath slowly, and observing the temperatures at which melting begins and is complete.

What is the best way to set up and measure melting point boiling point?

The most common and most basic method of determination is the capillary method. This method involves placing the sample in a capillary tube and running an experiment that will heat the sample until it reaches melting point. The melting point can then be recorded.

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How do you predict melting point?

By thinking about noncovalent intermolecular interactions, we can also predict relative melting points. All of the same principles apply: stronger intermolecular interactions result in a higher melting point.

How do you determine the melting point of a mixture?

A mixed melting point can be taken, by measuring the melting point of a sample composed of roughly equal volumes of the unknown product and of known 3-nitrobenzaldehyde (ground together well with a mortar and pestle, as in Figure 6.18a).