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

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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.
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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.
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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.
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  • Fall '13
  • JeramyBaum

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