3) If a solid melts over a narrow range (1-2 C), is it considered pure or impure

Question

3) If a solid melts over a narrow range (1-2 C), is it considered pure or impure? 4) What is the effect of an impurity on: a) the melting point of a solid b) the melting point range of a solid 5) What is the purpose of using the technique called mixed melting point? 6) Sample A has a melting point range of 141-143 and sample B has a melting point range of 141-143 C. A finely ground mixture of A and B has a melting point range of 130-139 °C a) Would you expect A and B to be pure compounds? Briefly explain your answer a) Would you expect A and B to be identical compounds? Explain your answer.

Explanation / Answer

(3)

If the solid melts over a very narrow range, then the solid is considered to be relatively pure.

(4)

As the impurity is added to a solid, the melting point of the solid decreases, and also its melting point range increases, which means it may melt over a wide range of temperature.

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