Question: A student reported to her instructor that her unknown contained salt, salicylic acid, and sand. In reality the unknown contained only the first two components,

A student reported to her instructor that her unknown contained salt, salicylic acid, and sand. In reality the unknown contained only the first two components, but no sand. What might have led the student to believe sand was present in the unknown? How could the substance be tested to determine if it was actually sand?

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