Why you are doing this experiment and What you will learn in the process DIRECTI

Question

Why you are doing this experiment and What you will learn in the process

DIRECTIONS our instructor may suggest additional tests to carry out on your hydrocarbon Your unknown hydrocarbon is flammable; keep it away from flames and hot surfaces. Purification and Boiling-Point Determination. Obtain a sample of the unknown hydrocarbon from your instructor number and the ambient barometric pressure in your laboratory notebook. Select a suitable heat source and assemble an apparatus for simple distillation [OP-30] using a boiling chip or a stirring device. Be sure that the thermometer bulb is positioned correctly in the Hickman still. Distill the liquid slowly, setting aside a low-boiling forerun or high- boiling fraction (if any) for later disposal. Record its boiling range and the temperature when about half of it has distilled (the median boiling point) (see OP-34a). Then carry out a boiling-point measurement [OP-34b] on the hydrocarbon using a capillary-tube method. The resulting boiling point should be within 1-20 of the median distillation boiling point. If it is not, repeat the boiling point measurement or redistill the hydrocarbon. . Record its identification ction to the boiling point if the atmospheric pressure was below 750 torr. Density Measurement. The temperature of the purified hydrocarbon should be close to 20°C. Accurately measure [OP-5] 0 into a clean, dry, tared vial using a measuring pipet or an auto Stopper the vial immediately and weigh [OP-4] it to the nearest milligram on an matic pipet. accurate balance. Calculate the density of your hydrocarbon from

Explanation / Answer

The properties like boiling point, refractive index, and density of a chemical are its physical properties.

1. A lot of other properties depends on these basic properties.

2. These properties of a substance also help in identification of the compound. For example, if you have an unknown compound and you want to identify it, then you can do it by studying these properties and comparing it with the already available data.

3. These properties also tell about the purity of the compound. For example, suppose you are studying refractive index of a compound and you know the actual refractive index of that compound. If both the values are different, then you can say that the compound is not 100 % pure and has some impurity.

So, from these properties, we are learning the basic properties of the compound and identification of an unknown compound.

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