A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (non-reacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.

Answer:

Melting Point.

Explanation:

In testing of a sample has impurities, we have to check the samples’s melting or boiling points or we a separation technique called chromatography.

Now, CaBr_2 which is calcium bromide is a White Hygroscopic Powder. Therefore it is a solid.

Now, a pure solid will always have a fixed melting point which means that it will melt completely at only one temperature.

However, if there are impurities, the melting point of a substance is affected in two ways:

-It's lower than than the fixed melting point

- It would melt at a range of different temperatures as opposed to a fixed temperature for the pure form.

Therefore, a quantity that can be used to determine whether the sample was pure will be melting point.

Final answer:

The student could analyze the melting or boiling point of the sample to determine its purity.

Explanation:

In order to determine whether the sample of is pure, the student can analyze the melting point or boiling point of the compound. The pure compound will have a specific melting and boiling point, while the presence of impurities can cause a change in these values. By comparing the experimental values of the sample with the known values of pure the student can determine whether the sample is pure or contaminated.

A pure solid, on the other hand, will always have a set melting point, meaning that it will only melt fully at that one temperature. The melting point of a substance, however, is impacted by impurities when it is lower than the fixed melting point. Additionally, in contrast to the pure form's constant temperature, it would melt at a variety of various temperatures.

Learn more about Melting and boiling points of compounds here:

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