9. In Part A, what special precaution should be taken before a solid sample is placed in a water bath that has already been used in a melting point determination? 10. What is meant by the term mixed melting point? 11. Explain how the suspected identity of a compound is confirmed using mixed melting points in Part C. 12. A mixture of two substances was heated in a melting-point capillary that was properly mounted in a water bath. The solid sample first appeared to be wet at 64.0C and was completely melted into a clear liquid at 78.0C. What temperature would be used as the melting point