Melting point

Experiment 3: Identification of an Unknown Mixture by Extraction, Recrystallization, and Melting Point Determination Abstract In this experiment, an unknown compound was identified using extraction and recrystallization techniques. This was followed by a determination of the melting points of the extracted and recrystallized substances. Each unknown compound consisted of two substances that were either a carboxylic acid, a phenol or a neutral. In this particular experiment, unknown compound three

Post-lab Questions: What effect would poor circulation of the melting point bath liquid have on the observed melting point? Poor circulation of the melting point bath would cause inaccurate measurements, either lower or higher than the actual melting point of the tested compounds. Poor circulation can cause different temperatures in the bath. In specific, the measured temperature is at the location of the thermometer, while the sample’s temperature could have experienced a different temperature

Acid, Benzoic Acid, and Naphthalene Charles Nyberg Gilbert Immanuel and Rachel Zigelsky Mussie Gide   Introduction Chemical experiments are often described, when they are finished, by the yield or recovery of the target product or solid. Also melting point can be tested to determine purity in a compound. Most times these chemicals are not completely pure so they can be recrystallized to remove the impurities. The technique of recrystallization learned and utilized in this lab works best to remove

acid had true melting points of 132 °C generating a .75 percent error. The 50:50 mixture of urea and trans-cinnamic acid started to melt quickly at 98.5 °C, slowed down at 102 °C, at which point most of the compound had seemed to have melted with the exception of a few crystals, which did not melt completely until 125°C . In the second part of the experiment, the melting point of an unknown compound was measured at a fast rate, 10 °C/min, in order to obtain an estimate of the melting point of that compound

Introduction In Lab 1, Production of a Solid: Crystallization and Melting Point, the objective was to become more familiar with basic lab techniques and tools by implementing several basic techniques, crystallization, determination of the melting point and thermometer correction, in order to determine the melting point of Benzoic Acid and identify an unknown solid acid through recrystallization. Crystallization is a separation technique used to purify a solid substance. The process separates a solid

be benzoic acid (36.4% yield), meta-nitroaniline (52.7% yield), and naphthalene (52.7% yield). These identities were confirmed after separation and isolation using melting point analysis. The melting point observed for the benzoic acid was 121.2-122.5ºC, the meta-nitroaniline’s was 111.5-112.8ºC, and the neutral naphthalene’s melting range measured 78.7-81.2ºC. These observations support the claim that the mixture was successfully separated into its three original components. EXPERIMENTAL PROCEDURE

determine the structure type and identify the four white powders. This includes conducting tests of melting point, flame color, solubility and the conductivity in water (H20). The melting point of a substance is the temperature at which the material changes from a solid to a liquid state. The determination of melting points is a form of identification and test method for organic substance. The melting point is an easy way measure and classify substances. Testing the flame color is an appropriate test

mechanism was determined based on the purified product’s melting point. This was accomplished by comparing the acquired melting point with the one provided by Professor Link. (Q1) When 0.252 g of trans-cinnamic acid was mixed in 2.5 mL glacial acetic acid and introduced to 0.434g pyridinium tribromide, the resulting product reflects an addition reaction. In general, reactions take place to achieve its lowest Gibb’s free energy because it’s at this point where a structure is most stable; in this case, the

Geometric Isomers post Lab 9/2/15 1) As conducted in pre lab question, melting point for Maleic acid is 139- 140◦C and Furmaic acid is 287◦C, and in the lab experiment the sample of A and B was identified first by test the melting point for each sample, and the result came as test tube B melted faster than test tube A, which leads to test tube A is Furamic acid and test tube B is Maleic acid, because of the low melting point for Maleic acid, it melted faster than Furamic. Furamic acid requires more

1. During the first part of the experiment, it was concluded that given the information of the melting points of maleic acid and fumaric acid, the two unknown substances could be identified. In stating so, maleic acid had the melting point of 132.5 while fumaric acid had the melting point of 287. During the experiment, a pea-sized sample of each substance were collected and melted with a Bunsen burner. Test tube B melted faster than test tube A, which relatively stayed the same. With the data collected