The composition of the bottle can be confirmed by qualitative analysis.
The term qualitative analysis refers to the procedure that we use to identify the substances that are contained in an unknown substances. In this case, we have to carry out a series of test in order to ascertain that the sample is NaF.
Now, we have to divide the sample into two and subject the first part to a flame test. If a yellow flame is observed then the sodium ion is present.
To the second portion we have to add concentrated sulfuric acid. The occurrence of oily droplets could signal the presence of the fluoride ion. If sad is added to this reaction mixture and heated before water is added, the appearance of a white gelatinous deposit confirms the presence of the fluoride ion.
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