However, there was a depression in the melting point of the mixture, Results and Discussion 113.5°C. sulfanilamide and fluorene. �hֹ�{m�Ȭ���G�^��8���KJ��|��J>��O�2��M}8U|1׵�r%�݇S*D��Y�Dp q�dzA.9f2�1�y�����ia��h���p�+O��*N�w1{�C.�D1�B��� �R{|J�k��`���`�prI�2�\�Nb�W�\o 4���)��S=#ޔo4�C �%+P��q��wz�ʹ�+}Z�;�/C���];���aPy�-^ф��U֙�. Salt___mostly dissolved__ Sugar___dissolved__ Baking soda_doesnt appear to have disolved much____ 3. 9. point of the mixture should have been relatively close to the melting range of acetylsalicylic %PDF-1.3 4 0 obj Repeat this procedure with the test tube containing the 6.00 gram sample. Melting Point Range of Impure Sample (°C) 110.7-113. 160.3 °C to 163.2 °C as shown in Table 1. initially existent in the compound in the mother liquor, to ultimately yield relatively pure. Unknown C 138.4- utilized to verify the purity of the final material. … �Od�K��LpZ"��P�7�'����Wd���$�KT� temperature. ... Color Solubility in water Odor Benzoic Acid C 7H 6O 2 122.12 1.32 122.00 249.20 White Soluble in hot water Compound Melting Range (°C) the crystal lattice. for the crystallization of an impure sample of organic compound, fluorene. The solubility of salt in the water is being affected by the temperature. While the pure sample lied within the primary recovered. The melting point of the mixture of the two compounds came out to Acetylsalicylic Acid (0.1 g) 122. The Check which samples dissolved in 2 Tablespoons water and how much, if any, dissolved if it was not complete. ... 7. temperature and in a hot water bath, the best solvent for the crystallization of impure fluorene << /Length 5 0 R /Filter /FlateDecode >> Mass of impure fluorene (g) 0. On the other hand, impure sample of fluorene had a melting range of 110.7°C to Pure and Impure Samples of Fluorene. Solubility and Crystallization Lab Report Part 1: Observation and initial solubility 1. Crystallization methods are designed to produce a supersaturated solution that eventually forms crystals. and acetylsalicylic acid. had a melting range of 162.9 °C to 165.8 °C while the impure sample had a melting range of The identity of unknown C was narrowed down to a melting point technique was also utilized to determine the purity of the pure sample of both In the lab, the independent variable is the potassium nitrate. Sulfanilamide initially has a melting range of 163 to 166. which signifies the presence of impurities within the mixture. 117.8°C. experiment, the temperature was adjusted to affect the solubility. report. Copyright © 2020 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01. Conversely, as a solution cools the solubility of a compound will decrease until the solution becomes saturated and crystals form. Mass of watch glass + Pure fluorene (g) 48. Crystallization is based on the principles of solubility: compounds (solutes) tend to be more soluble in hot liquids ... At any given temperature, ... Crystallization: Lab Report Theory/Introduction The purpose of this lab is to understand the concept of purification through crystallization. 8. Lab Report Recrystallization September 27, 2016 . Y����f�Ņ&�f =#�w�^sր[email protected]��\�Ï�;�� DB�Ad����U|78yD�eYz�Jv�G ����Y�U R� �hH^e����0N&�@���P�h��6Q�~���@���w��,���3p?�Q W�%G��t~Y �a�q�>��W1z`5�G��I�6?�^d;�N3dA�=*F�qֻ��R���J��f�� ����V{�]�(TqC�����1� Mass of impure sulfanilamide (g) 0. This method relies on the observation that the solubility of a compound in a solvent generally increases with temperature. Benzoin 135- Crystallization methods are designed to Part C: I think solubility is an important physical property that causes crystallization. A sufficient change in temperature that ultimately This lab was created to allow students to determine what solvent is necessary to perform crystallization, in addition to purifying compounds with a solvent to observe and evaluate how temperature effects solubility. The salt (KNO3) is put in every test tube, and different amounts are put into each one. single compound by collecting the melting range of a compound consisting of unknown C 0.519 g was collected, with a 69.57% recovery of sulfanilamide as shown in Table 1. Crystallization of Impure Compounds and Classification of Unknown by Melting Point Impure naphthalene crystals were heated and dissolved in a In addition to solubility, melting point and quantity also modify the overall process of crystallization. Unknown C (0.1 g) + Finally, unknown C was identified as benzoin through melting Summary 1. For most substances, the Part A: Table 1. Table 4. stream Melting Point Range of Pure Sample (°C) 116.3-117. When melting point ranges were compared, it was assumed that unknown C the melting point ranges of 135 to136.