RB,+NP,+HP,+JA

Your task is to purify your foul water using the procedures provided. You must record your observations, measure the amounts of water and waste separated, and analyze the success of the overall process. In your analysis, you must__//incorporate//__, not define, the vocabulary words listed below to show that you know what they mean.

Your grade will be based on the samples you produce at the end of each stage of the purification process, the completeness and quality of your observations, measurements, calculations and analysis, the degree to which you accurately apply your vocabulary, your lab technique and safety, and your individual participation in the group. Your final water sample and analysis are due in class on Wednesday, September 21st.

Vocabulary: Neel chemical property, physical property, homogeneous, heterogeneous, suspension, solution, density, filtrate, atom, element, molecule, compound, physical change, chemical change

Analysis: Ryan,
The first step of purification that we took in the lab was splitting the oil and water from each other, this was successful because the oil was layered on top of the water, so we used pipers to remove the oil. The second step was getting rid of the separate substances in the now brown and yellow water, we used rocks and sand to divide the substance and the water. The third, and final step was adding charcoal to the almost purified water and we used filter paper to make the charcoal filled water into purified water.

Analysis: Heather,
In the lab we were doing we had to purify water that was already contaminated and was clearly a **compound**. The liquid, a **suspension**, was brown and yellow with a lot of sediment of black on the bottom and also floating particles. After we took all the oil out of the water and put it in the test tube, the color of the water got dimmer and had some bubbles in it. While we sand filtrated it, the water no longer had the black sediments in it they disappeared. After we did that step we had to use charcoal to absorb the water. The charcoal, a **filtrate**, was sitting on the top of the water and the color was dark grayish blue, you couldn’t see the bottom it was too dark. The last step we had to do was filter the charcoal out of the water using 150 ml beaker and a funnel. **Chemical change** was when there was also an odor to the water that smelled like black pepper and olive oil. **Physical change** was when we poured the charcoal water in the funnel and it was taking a long time but when it finally started coming out of the funnel it was clear, regular, **homogeneous**, water that you would drink normally.

Our water lab consisted of a few methods of purifying it3. Prior to treatment, the water was a dark brown/ yellow color, there was black sediment throughout the contaminated water. It smelled of Olive oil soil and ground black pepper. We extracted the oil using small pipers, and once the oil was extracted we were ready for the next step. At thins point he yellow top layer is gone. The water still contains sediment and is still brown. By placing gravel and sand into a punctured cup we were able to filter the still dirty water. This resulted in the water being free of the black sediment that was there in the beginning of our lab, and had a color change of a very light drown/yellow color as opposed to the dark brown that we started with in the lab. Once that was done we measured our water again and added charcoal powder to it. A bit of the powder sat on top of the water as the rest dissolved and turned the water a black indigo. Soon after we used filter paper and a funnel to pour our now charcoal powdered water into. We added the charcoaled water in gradual amounts to our funnel structure. Water dripped out of the funnel at a very slow pace, but the water that landed into our 250ml beaker was transparent and free of any black charcoal coloring, and purified.
 * Analysis: Jade,**
 * Before the filtration we had 200 ml with three different colors.The top layer, which consisted of the oil, which had looked like a light yellow. the second layer was bit darker then the oil it had a gas like color. The non purifications and particles remained in the bottom layer.
 * After the oil we had removed all of the oil It was not as dark as it was before. It separated the water from the oil from the solution. The solution had not looked as fat/thick as before, and the impurities still lay in the bottom. the oil was gone still the water is not as purified as it should be we still need to remove the particles and make it look as if it was ready for human consumption.
 * After the sand filtration, the color of light yellow and the oil is completely gone. This water now resembles water more than before, and the odor was not there, showing that progress was made and that there is now a possibility that it will be done.
 * As it passes through the filter, the filtrate now shows clean water and has no smell of garlic, and the water is now seeming that is possible for human consumption although there is nor garlic smell htere is still nasty smell that is both pleasant to the body, but still the water was much more sanitary then it had been in the begining.

Procedures: adapted from ChemComm 5th Ed. pp. 10-15

Observations: as recorded on your data chart, to be incorporated into your analysis

Calculations: % yield after each step of purification

Analysis 1. description of original sample of water and of the sample after each step of purification - focus on how your water sample changes from step to step The original sample of the water was filled with impurities such as oil spice and etc. 2. The first step of the purity cycle was that we had to get rid of the oils with pipers the oil was on the top and yielded to the side. 3. discussion as to the efficiency of each step of purification (refer to both observations and calculations) - efficiency refers to both time and materials used as well as the amount of your sample that you are able to recover; decide whether or not you would consider each step efficient based on the amount of water you lost and how much your water was improved by that step.