Melting point

Crystallization and Melting Point: Joseph Katz and Melissa Colwell Binghamton University, Department of Chemistry, Binghamton, New York 13902 Introduction: One of the most important parts of this experiment was the concept of the melting point. The melting point is the temperature at which a substance turns from a solid into a liquid. Every substance has a specific temperature of melting point although any impurities

The melting point of a chemical is a physical property inherent to that substance. The chemical changes from a solid to a liquid state, but the composition remains the same. It can be used to determine the identity of an unknown substance. The purpose of this experiment was to discover the identity of an unknown chemical by determining its melting point. The unknown substance was determined to be trans-cinnamic acid. When the unknown and trans-cinnamic acid were mixed, the mixture melted in a similar

Introduction: Melting point and Boling point are two fundamental physical properties that are commonly used to identify unknown compounds, to verify already known compounds, and to determine the purity of compounds.2 If the compound is a solid, the procedure for melting point determination is followed. However, if it is a liquid a boiling point technique must be performed, such as distillation or refluxing.2 The melting point determination consists of five major steps: obtain the sample and make

Lab 1: Melting Points March 15, 2018 Tina He Lab Partner: Gian Izquierdo SCC 251.275B Instructor Professor Olga Lavinda Abstract This experiment was performed to determine the melting point ranges of standard substances, urea-cinnamic acid mixtures, and unknown substances. The melting point ranges were measured by observing the temperatures in which the substances began

display the melting point range of each of the chemicals tested. Table 1 represents the results found in part 1 of the lab. It was found that the 50-50 mix has the lowest melting point. This is likely because the less pure a compound is, the lower its melting point will be. The 50-50 mix is the least pure of the 3 compounds so therefore the melting point was lower. In Part two of the lab it was found that the melting point range of the unknown compound (shown in table 2) is closest to the melting point

Results The results show that the highest melting point was 4–Hydroxybenzoic Acid and the lowest melting point was Sulfosalicylic Acid. The highest boiling point was Octanol and lowest boiling point was Methanol. When it came to the percent error the highest percent error calculated was pentanol and the lowest percent error was Propanol. Discussion During this lab the melting point ranges and boiling points were recorded from several substances. Based upon the structures of these various samples

Abstract: The melting point and mixed melting point methods were used to determine identity and purity of samples. The melting points were obtained from phenacetin, acetaminophen, tartaric acid, and 9:1 mixture of phenacetin and acetaminophen by using an apparatus. The melting point range of phecacetin, acetaminophen, tartaric acid, and 9:1 mixture of phenacetin and acetaminophen were 123.4-124.8oC, 154.4-155.1oC, 154.3-157.5oC, and 104.3-114.9oC respectively. With a melting range of 121.8-123

The first part of the experiment focused on finding the melting point range of known substances, Trans-cinnamic acid and Urea. The Trans-cinnamic acid had a melting point range of 133.0-135.8℃. Urea had a melting point range of 132.5-135.8℃. However, when a 50/50 mixture was created of the two substances, the melting point range was 98.8-132℃, 40 degrees less than the two known substances. This is due to an impurity of the 50/50 mixture. Each substance was acting as an impurity to the other substance

The melting point that was observed for N-(4-butoxyphenyl)acetamide was 109.7˚C, and is lower than the literature value range of 131˚C. (Royal Society of Chemistry. 2018). This may be due to the presence of water and that impurities may be still present in the product that was formed. Solid substances that contain soluble impurities typically melts at a lower temperature than the pure compound (Kirsop. 2017). This is because the impurity disrupts the repeating pattern of forces that holds crystalline

gift sample from Sun Pharmaceutical Industries Ltd (Silvassa, India). Melting point of the synthesized analogues was determined by using Stuart melting point apparatus and were uncorrected. Equimolar (0.01mol) quantity of NaCNO in 25ml of warm water was added with continuous stirring, the reaction mixture was allowed to stand for 4 h and the product was obtained by filtration, washed with water, dried in an oven below melting point and recrystallized from ethanol to afford key intermediate-1 .The precipitate