Liquid solution of A+ Liquid solution + solid Liquid solution I Sold A +soid B 8

Question

Liquid solution of A+ Liquid solution + solid Liquid solution I Sold A +soid B 80 20 60 40 40 60 20 80 %A 100 100 Composition. trol%) Figure 4.9 Melting point composition diagram for the binary mixture, A + B. In this diagram, a is the melting point of the solid A, b of solid B, e of eutectic mixture E, and m of the 80% A 20% B mixture. A. 2. A practical cons equence of this colligative property is that a small amount of impurities or solvent will: a) always increase the melting point; b) have no effect on the melting point; c) broaden the range of the observed melting point; d) lower the observed melting point; or e) both c) and d).

Explanation / Answer

2. option E

Melting point (m.p.) analysis can also provide information about the purity of a sample. A substance (solid) containing soluble impurities usually melts at a lower temperature than the pure compound. It can also melt over a wide range of temperatures and is called the “melting point depression.”

In general, the smaller the range of melting temperatures, the higher the purity of the sample

reason

It’s not difficult to understand how impurities affect the melting point. Foreign substances in a crystalline solid disrupt the repeating pattern of forces that holds the solid together. So a smaller amount of energy is required to melt the part of the solid surrounding the impurity

Related Questions

Navigate

• Browse (All)
• Browse L
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.