2 The proper heating rate is 1 2 C per minute If this heating rate is exceeded

# 2 the proper heating rate is 1 2 c per minute if this

• Lab Report
• 6

This preview shows page 3 - 6 out of 6 pages.

2. The proper heating rate is 1-2 °C per minute. If this heating rate is exceeded, the solid might melt too quickly to accurately measure the melting point range. The inability to measure the melting point range would thereby hinder the process of identifying the unknown compound.

Subscribe to view the full document.

3. A. If the compound turns from white to brown, then the compound has been overheated and decomposed. In this situation, one must restart the experiment and ensure to maintain a lower temperature to avoid overheating. B. If the compound slowly disappears from the capillary tube before melting, then the compound has sublimed from solid to gas. In this case, the capillary tube should be sealed with a cap after more compound has been put into the tube. 4. A. Melting point of Ferrocene: 173-174 °C Melting point of Acetylferrocene: 81-83 °C B. Melting point of Adipic Acid: 151-154°C Melting point of Citric Acid: 153-155 °C 5. In order to identify the unknown sample, the mixed melting point method must be used. One will have to obtain a sample of adipic acid and citric acid, and mix each with some unknown compound. Both mixtures would then be tested for the melting point, and the compound with the least change in the melting point range from the literature will be the unknown compound. 6. A. Begin by determining the number of drops in 1 ml of chloroform. Divide that number by 0.8 to determine the number of drops needed to measure 0.8mL and use a pipet to deliver the amount. B. Use the density of methanol to calculate the volume needed for 1.2 grams of methanol. Add that volume of methanol into a vial using a pipet.
C. Using a pipet, transfer 38 drops of methylene chloride into a graduated cylinder and measure the volume. Then use the density of methylene chloride and the volume to calculate for the mass of methylene chloride in 38 drops.

Subscribe to view the full document.

• Fall '13
• JeramyBaum

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern