Melting point

Analysis Techniques Joshua Nash and Aquilla Young Abstract The introduction of this lab report exposes the reader to the different scientific concepts that are to be used such as melting point calculations, retention factors, and solubility in various aqueous solutions. The experimental provides the basics of using a melting point apparatus, determining solubility, and performing thin layer chromatography. In the results section the findings of my experimental are tabulated and presented in a…

Exp D. Post Lab Questions 1. What is the purpose of the concentrated sulfuric acid in the first step? The purpose of using concentrated sulfuric acid is to activate the reaction of salicylic acid and acetic anhydride and produce the acetylsalicylic acid, which is aspirin. The sulfuric acid is used to protonate oxygen atom of a carbonyl group of salicylic acid. 2. What would happen if the sulfuric acid were left out? Removal of catalytic acid from the reaction would slow down or not proceed…

In this method, a solute is dissolved in a solvent at boiling point to increase solubility. The new solution is then cooled to get pure crystals of the solute. Using this technique of an unknown helps one get a pure substance which could be tested for melting point. In Figure A, the red arrows show the series of test the first unknown 64A, was put through to determine what type of substance it was. Unknown 64A…

First, the contaminants during the transition steps of the experiment appear in the final product. These contaminants in starting materials could appear and cause the melting point of the product to have a larger range. Second, during purification measures, such as recrystallization and filtration, these steps may not go to competition leaving behind some of the undesired experiment materials. Third, there are several side…

Which element has the lowest melting point? The chemical element with the lowest melting point is Helium and it melts at -272°C. 4. Which element has the 8th lowest melting point? Krypton is an element with the 8th lowest melting point. Krypton will melt at a temperature of -157°C. 5. Which element has the highest melting point? The element with the highest melting point is Carbon. It melts at a temperature of 3500 °C. 6. Which element has the 2nd highest melting point? The element with…

liquid at room temperature and therefore has a low melting point which is a property of a covalent molecular substance. Substance B was found to be a metallic substance as it demonstrated properties such as high melting point, conductivity as a solid etc. Substance C was found to be a covalent network structure as it did not conduct and was very hard and had a high melting point. Both Substances D and E were very brittle, had a high melting point and conducted in a solution, therefore it can be…

the ylide then reacted with the cinnamaldehyde. A majority of the major product stayed in the organic layer, but some was recovered from the aqueous layer. After trituration and recrystallization, the product formed was weighed (~0.025g) and a melting point and IR spectrum was recorded for further…

small covalent structures to have a low melting/boiling points, they don’t conduct electricity because they don’t have any free electrons or an electric charge overall. • Macro molecules will have large covalent structure compared to the small covalent substances such as h2, co2 and o2; more atoms are present as they are arranged into the giant lattices that’s why they have a strong structure because there are more bonds. Macromolecules have a high melting point this is due to having a lot of…

Also, heating too fast can cause a heat lag, where the crystals aren’t heated to the same temperature as the thermometer, causing an inaccurate melting point…

to a carbon-carbon double bond is hydration of alkenes. In this experiment norbornene was used as an alkene to lead the formation of the alcohol. The purpose of this experiment was to make and receive weight of norborneol, percent yield and the melting point of the product. Hydration and the opposite reaction of dehydration establish equilibrium between the two competing processes. To complete the reaction of hydration, double bond will require excess water and to complete the reaction of…