Recrystallization Lab

1) Separate the solid from the liquid in the beaker by decanting the liquid. Ask your instructor to demonstrate the correct procedure.

8. Crush crystals into powder with a stirring rod and use a melting point device to determine the melting point of your active ingredient.

Next get the three types of waters with the different temperature and measure 50ml of water. Take the thermometer and write down the temperature of the water . Then measure 4 grams of sugar of the balance with the wax paper. Then you are going to take the sugar and pour it in the hot water and immediately start the stopwatch and start timing the sugar dissolving. Stir with a straw until fully dissolved.

We were given the following materials: Fluid cornstarch Ice Hot water Thermometer Plastic cups Old newspapers for protecting the tables Procedure: Put the cup of fluid cornstarch inside a bowl of ice so that the fluid cornstarch, and the ice do not mix. Leave the cup in the bowl for about ten minutes so the fluid cornstarch can cool down. Feel the fluid cornstarch for texture, and consistency.

2) Obtain a thin glass capillary tube, press the open end of the capillary tube into the substance(around 2-3mm), do one sample at a time

Number three test tubes 1 to 3. Add 2ml of monosaccharide solution to tube 1. Rinse out afterward in a cup of water.

Cool down the test tubes to 0^o C in a beaker of ice water. Use the thermometer to ensure the solution is the correct temperature. Once the test tubes become the desired temperature, add 10 drops of the catalase solution to each test tube one at a time.

A heat pad was set up in a place free of outside interference, as was the room temperature station and a shelf was cleared in the fridge. Once setup pour 25ml of the crystal solution into each beaker. Once the solution is in mark one beaker as the room temperature, one as the fridge and one as the heat pad.

Actual Mass of Product. If you have not already done so, weigh your dry recrystallized product. If your product isn’t dry place your vial in the oven in the room for 10-15 minutes.

12) The Ziploc bag was placed on the weigh boat, massed, and the mass was recorded in the data table after the mass of the Ziploc bag was subtracted from that total. 13) The containers were washed and dried. 14) Steps 1-13 were repeated two more times with heavy cream at the same temperature of 3˚C, then three trials were done for each of the four other initial temperatures of heavy cream – 8˚C, 13˚C, 18˚C, 23˚C. Steps 1 & 4-13 were repeated for all temperatures. 15) Steps 1 and 2 were repeated.

To tube 2 and tube 3 a boiling chip is added. The two tubes are boiled to remove any residual ether. Next, the tubes are cooled to room temperature and placed into an ice bath to allow for crystallization. The solution is then removed from the solid in each tube and discarded. To tube 2 and 3 ~0.5 ml of H2O is added for recrystallization, the tubes

As soon as the crystallization starts (it looks like it's snowing inside the test tube), note the temperature on the thermometer. If one miss the crystallization point, one can place it back in the hot bath, and repeat steps 4 and 5.

When it comes to creating or performing a reaction, the solubility of the product being used is very important. Knowing the biological and physical processes of your product is the start of any experiment. Obtaining this information plays a key role in choosing solvents for processes such a recrystallization. Recrystallization is a procedure for purifying an impure compound in a solvent. It is used only to purify solids in large or small quantities. That is the purpose of this experiment.

Recrystallization is a technique frequently used in organic chemistry to purify solid organic compounds. The goal of this technique is to allow organic compounds to form crystal lattice structures, and to remove any of the impurities that do not align within this crystal structure.1 The theory behind recrystallization revolves around entropy; as heat will cause a organic compound to dissolve (increase in entropy), a decrease in heat will then allow that organic compound to reform (decrease in entropy) and become purer.2

List the basic steps in the recrystallization of acetanilide. Include the identity of the solvent that will be used and what is added before hot filtration.