422-002+lab+Mixtures+2

Observations Mass of sample: 19.10 g Mass of beaker: 76.86 g Water turned blue when copper chloride was added When put onto hot plate, water started turning green because the water was evaporating.
 * __Dr. Reich’s Mixture Mess__**

Analysis Materials: Copper chloride mixture, filter paper, ring stand, iron ring, funnel, beaker, scoopula, hot plate, and sand. Step 1. First, weigh your beaker, and the sample that was given to you. Step 2. Pour the sample into your first beaker. Step 3. Now fill your beaker with about 25 mL of water, and stir. (The water should be turning a bluish green.) Step 4. Take your funnel and put the filter paper into it ( make a smaller funnel out of the filter paper so that it fits into your plastic funnel.) Step 5. Then, pour your mixture through the funnel into your second beaker ( this should keep out the "junk" that was accidently mixed in with the copper chloride.) Step 6. Next, take your beaker and put it on the hot plate. Wait a about 5-7 minutes to see what happens. Step 7. Our group only got this far, however, we would have waited for the water to evaporate. Step 8. When the water would have evaporated, the copper chloride should have been left behind. Step 9. Lastly, we then would have weighed the dried copper chloride left behind from the evaporated water, and compared it to the original weight.

Hypothesis The copper chloride was at first a pure compound before it was mixed with other elements from the floor (the sand and rocks). Then, the copper chloride became a mixture. To separate the junk from the copper chloride we needed to add water to dissolve it, and to leave out the junk by funneling it out. When the mixture of the copper chloride and the water was put onto the hot plate, the water began to evaporate. So all in all, the copper chloride went through these stages: Solid---Liquid---Solid Pure compound---Mixture---Pure Compound

Techniques My group and I used to two techniques to separate the copper chloride in this lab. One of them was separating the copper chloride from the "junk" by adding the two together with water, and then funneling the junk out, leaving the copper chloride with the water. The second way was by heating up the mixture of the water and the copper chloride, and having the water evaporate, also leaving the copper chloride behind.