Tuesday, June 25, 2013

It not myth, just call us lith: Water Testing Lab Report

Makena, Nicolette, and Nina
Chemistry
Dr. Forman

Don't stop pour that drop, see that color change then stop. Get a table write results, grab your group and then consult, are there ions are there not it interests me a lot.




Abstract: The purpose of this experiment was to test the water so we could learn how to detect precipitate, and invisible substances in the unknown water samples. We used four techniques to test the water: the calcium test, iron test, chloride test, and sulfate test. Through those steps we discovered that each water source and reference reacted the same or differently from the others when we added the test solution. We noticed that when there was a change in color or clarity that meant there was percipitate present causing it to carry either calcium, iron, chloride or sulfate ions.

Procedure:
Calcium Test-
1. We added 20 drops of calcium chloride solution in the first well as the reference
2. We added 20 drops of control in the second well
3. We added 20 drops of tap water in the third well
4. We added 20 drops of ocean water into the sixth well
5. We added 20 drops of distilled water into fifth well
6. We added 3 drops of sodium carbonate into each solution
7. Two wells turned pink so we dumped everything out and washed our plate well and started the  process over with a new plate well
8. Then the tap water turned pink again so we moved
7. Wrote the results of each reaction



















Iron Test-
1.We added 20 drops of ferric nitrate in the first well as the reference
2. We added 20 drops of control in the second well
3. We added 20 drops of tap water in the third well
4. We added 20 drops of ocean water into the sixth well
5. We added 20 drops of distilled water into fifth well
6. We added 3 drops of potasssium thiocyanate into each solution
7. Wrote the results for each reaction



















Chloride Test-
1. We added 20 drops of calcium chloride solution in the first well as the reference 
2. We added 20 drops of control in the second well
3. We added 20 drops of tap water in the third well
4. We added 20 drops of ocean water into the sixth well
5. We added 20 drops of distilled water into fifth well
6. We added 3 drops of silver nitrate into each solution
7. Wrote the results for each reaction



















Sulfate Test-
1. We added 20 drops of terrous sulfate in the first well as the reference 
2. We added 20 drops of control in the second well
3. We added 20 drops of tap water in the third well
4. We added 20 drops of ocean water into the sixth well
5. We added 20 drops of distilled water into fifth well
6. We added 3 drops of barium chloride into each soltuion 
7. Wrote the results for each reaction



















Results:
Calcium Test-









The reference(calcium chloride) and tap water have calcium ions present.
Iron Test-









The reference(potasssium thiocyanate) have iron ions present.
Chloride Test-









The reference(silver nitrate), tap water, and ocean water have chloride ions present.
Sulfate Test-









The reference(barium chloride), control, and ocean water have sulfate ions present.
Class Results:
This aggregated data shows all the lab data and the differences between the some of the lab groups results. With this data we can compare our results to other students to find out if our results were different and determine why might that be. For us we had no precipitate in control for the chloride test which may have been caused by us not looking close enough to see if the solution was cloudy, our solution could have expired or it could have been caused by the use of dirty plates well from past lab groups, which happened to our group during the calcium test.

Pg. 45 #1-4
1) A reference solution was used in each test for comparison and a blank was used to make sure that the solution was working properly and/or that the wells were clean because there should have been no ions in the blank (distilled water).

2) A problem associated with  the use of qualitative tests is that their may be contaminats leftover on your plate well, which can cause the reactions to be false.

3)The results cannot absolutely confirm the absence of an ion because we can't physically see the ions to be able to actually tell whether they are absent.

4) If we had not cleaned our stirring rods or wells after each test than the reactions of each solution would have been diffferent and each reaction would be false.

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