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.
