The students should conduct a boiling point test on the sample.
The easiest test to determine the water is to conduct a boiling point test on it. Pure distilled water boils at exactly 100°C. If the sample contains other ions in solution, then it will not boil at exactly 100°C as expected. The presence of impurities increases the boiling point of water.
Hence, to make sure they have unknown ions in their sample, the students may first determine the boiling point of the sample.
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