Suppose that biphenyl used in an experiment was (unknown to the experimentor) co

Question

Suppose that biphenyl used in an experiment was (unknown to the experimentor) contaminated with some inert, insoluble material. That is, the entire weighed sample was placed in the solvent but only the biphenyl dissolved. The impurity was inert and remained in the solid phase at the bottom of the testtube. Would the observed amount of freezing point depression,?Tf, be larger, smaller, or the same for the solution compared to the value obtained for a solution made from pure biphenyl? Explain your answer in detail.

Explanation / Answer

Only soluble materials can affect the freezing point of the solution so no. Colligative properties depend on SOLUTES with respect to the solvent. Keyword is colligative properties. Insoluble things don't affect the freezing or boiling point. Changes in freezing point is dependent on solutes alone. Good Luck!! Look up colligative properties to reinforce any doubt! ^_^

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