Department of Chemistry [Colligative Properties & Osmotic

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Department of Chemistry [Colligative Properties & Osmotic Pressure] Purpose : The experiment this week had two different purposes. The first is to teach us about freezing points. This lab was designed to show us the freezing point of a pure solvent, in comparison to a solvent in a solution with a non-volatile solute. The second goal of the experiment is to teach students about osmosis. In the experiment, we got to observe osmosis as well as understand dialysis. Procecure : Part 1. Colligative Properties 1. Create a water bath by filling ½ of the 100 mL beaker with cool water, adding crushed ice to the beaker so the water level is just below the top, and sprinkling salt into the beaker and mixing…show more content…
5. Use funnel to carefully fill dialysis tubing 1/3 full of Karo syrup. Close off other side of tubing like in step 4. 6. Completely submerge tubing in the glass bowl and observe over next several hours, record observations. 7. Clean up by pouring liquids down the drain, washing bowl and throwing used dialysis tubing in garbage. Raw Egg 1. Check to make sure the egg is not cracked! 2. Place egg in pint jar, record observations. 3. Pour vinegar over egg to cover completely, put top on jar, and secure for 12-24 hours to allow vinegar to dissolve eggshell. Observe several times and record. 4. After shell dissolved record observations of egg. 5. Carefully remove egg from vinegar and rinse with tap water. 6. Rinse jar well and half fill with Karo syrup. 7. Carefully place egg into syrup, put lid on and set aside for 12-24 hours. Observe egg several times and record. 8. Carefully removed egg from karo and gently rinse it under tap water, record observations. 9. Dispose of egg by throwing it in trash, rinse Karo down the sink and clean equipment. Observations: |Seconds |Distilled H20 Rm Temp |Distilled H20 Ice Bath |Salt H20 Rm temp |Salt H20 Ice Bath | |0 |22C |6C |21C |11C | |30 |22C |4C |21C |8C | |60 |22C |3C |21C |5C | |90 |22C |4C |21C |4C | |120 |22C |2C |21C |2C | |150 |22C |2C |21C |2C | |180 |22C |2C |21C |1C | |210 |22C |2C |21C |1C | |240 |22C |2C |21C |1C | |270 |22C |2C |21C |1C | |300 |22C |2C |21C |1C | [pic] [pic] B. Freezing

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