3. constructing a solubility curve for KNO3 in water. 2 0 obj
From your curve determine the solubility of KClO 3 is at 55°C. In our results, we observed that it is true that as temperature raises, so does the solubility of a material, but we also found it interesting that as the temperature went from 55'C to 65'C, the solubility of succinic acid dropped. %PDF-1.5
By determining the mass of solute that can be dissolved in a volume of solvent under a variety of temperatures we can construct a solubility curve. Example: Refer to graph to answer the following questions: 1. construct a solubility curve for a solute. 3 0 obj
However, to construct a solubility curve we needed three different temperatures in which we would record. After we aggregated our data I realized our mistake that as temperature rises, solubility never decreases. Date of experiment : 10th of November 2016 Objectives: To determine the solubility of two partially miscible liquids of phenol-water system. We could have added more than 20mL of distilled water on accident. Solubility graphs represent solubility in g per 100 g of water plotted against temperature. 2. To determine solubility of ammonium chloride at different temperatures. 2. Will 100 g of potassium nitrate at 50°C in 100 g of water create a saturated solution? In conclusion, I think my group worked really well with each other, and now that we have been with these groups for a couple of weeks, it's much easier to work with them. 6. A solubility curve illustrates how the solubility of a substance varies with temperature. o constructing a solubility curve for KNO 3 in water. The solubility curve lines show a saturated solution-a solution with a full dissolved volume of solute in 100 g of water. <>>>
As a class, there were a variety of of numbers on how much sussinic acid can be dissolved at a specific temperature. B. Introduction A solution can be saturated, unsaturated or supersaturated. What is less soluble in 100 g of water at 10°C sodium nitrate or sodium chloride? 2. So if I heated the reaction to a temperature higher than 65'C, I could guess that the solubility of the acid would increase too. We allowed the substance to heat, then cool, and then allowed it to sit at room temperature, which re-crystalized the succinic acid. To obtain the solubility curve for potassium chlorate, KClO 3 BACKGROUND: A solubility curve is determined for a substance so that chemists know how much solute they can add to a solvent in order to obtain a ... experiment. We noticed that as the temperature raised, so did the solubility of succinic acid. 4 0 obj
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In terms of molecular order, liquid crystal molecules have one-dimensional or two-dimensional long - range order. Solubility graph for salts: 3. Experiment 4 Solubility of a Salt OUTCOMES After completing this experiment, the student should be able to: measure the temperature at which a solution becomes saturated. I made use of the different properties of a saturated solution at different temperatures because I knew that succinic acid is a solid, so when the temperature rises, so should the solubility of the solute as well. These different results made the experiment more interesting because it kept me guessing. Beware of boiling or hot water, and take care when stirring the potassium nitrate solution. How to read a solubility curve? Although the process for each temperature was the same, the results were very different. Objectives 1. [�A�a���Yg���G#.��!�εp�oACxr,d�Uj�r�V���מ<8��T�P��4��y�T-1!>uo�R=�z$�u
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ŏ�'^Į3�֘*�\� ������+����U�v!$T����c���w�M��F�7TJ��5s'��B�F@A/�O%�. Finally when the temperature was heated even more to 65'C, two groups had a decrease in the solubility, and the rest of the groups had an increase of solubility as the temperature raised. What mass of Ammonium Chloride will dissolve at 50°C in 100 g of water? x��\[�ܸ�~7������F�J:X,��%q��{��`�M���:�Ӿ�䷟��(�j��d;ۭ��Eֽ�Q�/ﮛ�c��/�/��m��.�/����/~�����ݮy��v矏W�x��m�m~�5����췋���߲�ɼ�����g,+�_��"�\f��yͳ��ϟ�
����g�Y�"��\�����Y�z�'�¿���Af���\+wx�l\� �+�?�}���r�\2����W�횱���ӫ;�r�����3��Z��zE��}�U.�O_��[�\ Any sum below the line for a given substance indicates an unsaturated solution, and a supersaturated solution shows everything above the line. Objectives 1. This could affect my data because if i am testing the solubility at 45'C, I cant have the solution be at 55'C, that would throw off my whole data. oJ��8�pI;��-��JV �,�t�a�P���ʟ�;�?��?qV�y��\�������㺆E� ��@I��^���[���|u�}\3����
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��S�5�z�f��F����C;}ig$a�l�h|f��y�gE^��'�7����gl�����:o�o��qb� T��*��UL]�3Nld����_�{�U1CU�:/{��d�����'�C_?|^��՛�5e���q9;��<1t6e�+�����L��Zż��C�����poR2��Z�U���F�v�KQT��k£��u��@ya�r*�[��)���4�.õ�4h�����Z��G��f�(�[����@:��&W�+�x���@��(���zF7^��k��+���ق�ԥ��(��l� #���뚕�l����m�Нm֬����k�,��n�s���˯y�+z�}��+0Уi�6�MJ&%(���m�!=�U�]=��j\��q�Й?A��T5)/�l���.MW��* �a����nh����*D�1�+��C���D������@Yz�"�lw4ls?�m̕вW�Eiri^ʼ�߽������W+/p��}x?�[1�T�����ȐQ�:Wi6�Ԣ��) �3�X����yƊj�i�O�|��G��� The start of crystallization indicates that the solution has become saturated at this temperature. Part A. Solubility of Solid Compounds. I believe this information may be correct. <>
determine the concentration of an unknown solution from its saturation temperature. 1. 2. The different numbers from each group results in how well the groups followed directions. 1 0 obj
These temperatures included 45'C, 55'C, and 65'C. Another procedure for gathering data to construct a solubility curve would be to heat a solution and allow it to cool, without putting the solution in a ice bath. However, to construct a solubility curve we needed three different temperatures in which we would record. Hypothesis: According to data on the internet, 3.75 × 10¹ moles of potassium nitrate dissolve in 100g of water. The mean crystal height obtained by the class for each temperature recorded is 45'C the average was 14.1 mm. After working with my group, we had great success in solidifying sussinic acid in different temperatures. Liquid Crystal testing. However, to construct a solubility curve we needed three different temperatures in which we would record. endobj
After preforming the solubility curve for succinic acid, I was able to understand that as water temperature increases, so does the solubility of a solute. This could affect my data because it would require a warmer temperature to dissolve all the solute. These temperatures included 45'C, 55'C, and 65'C. The Solubility Curve of Potassium Nitrate Experiment Report Essay ... Locker Number: _____ CHEMISTRY 354-355 Experiment 2 SOLUBILITY 1. And for 65'C the average was 102.8 mm. 2. 5. Liquid crystal is partially ordered and anisotropic. Unit 4 B.3 (p.344) #1-4; Unit 4 B.8 (p.350) #1-6, ... 4S4SBS (p.360) #1-8 and 4SBS (p.361) #14-20, Lab Report: Relative Reactivities of Metals, 2SAS (p.132) #26-28, 29-34 and 2SBS (p.151) #1-8, Lab Report: Constructing a Solubility Curve, Prepare a warm- water bath by adding 300mL water to a 400mL beaker, Maintain this temperature with a thermometer, and by removing the beaker from the hotplate and putting it back on, Place 4g - 5g succinic acid in the test tube, Add 20mL of distilled water to the test tube, as well, After every 30 seconds for 7 minutes, swirl vigorously with a glass stirring rod, After 7 minutes, carefully decant the clear liquid from the test tube into a separate test tube, Pour the hot water from the beaker into the sink, Prepare an ice bath by filling a new 400 mL beaker with water and ice, Place the test tube containing the clear liquid in the ice bath for 2 minutes, Stir the tube in the ice bath every now and then, After 2 minutes, take the test tube out of the ice bath, and allow the tube to sit at room temperature for 5 minutes, Measure the height of the crystals collected in millimeters (mm), Repeat this process for the 55'C observation and the 65'C observation of succinic acid.