Disloved+Oxygen

Period 6 Group E- Rich, Kara, Nick, & Rosanna


 * Hypothesis: ** Our hypothesis is that if there is a low dissolved oxygen number then the river will be healthy enough to support life.


 * Prediction: ** If we do the dissolved the dissolved oxygen test, and we get a low oxygen number, then the river is healthy.

1.) Fill up the test tube with water samples from the river, don't let any bubbles in the test tube 2.) Put 8 drops of magnaous Sulfate Solution and 8 drops of Alkaline Potassium Iodine into the water then mix 3.) Let the water settle blow the shoulder of the tube 4.) Add 8 drops of Sulfuric acid 5.) Pour 20 mL into the titration tube 6.) Use plunger to get Sodium Thiousulfate 7.) Add 8 drops of starch indicator solution to make the titration tube turn blue 8.) Insert plunger into the tube, release Sodium Thiousulfate 9.) Keep adding drops until the water turns clear 10.) Take your readings
 * Procedure: **


 * Data: **
 * 1st Trail || 7.9 +/- 1 ||
 * 2nd Trail || 8+/- 1 ||
 * Conclusion: ** We believe that the river is healthy enough and clean enough to support life because the good numbers to support life is a 5 or a 6 and our data states that the river is over that amount by just about 2. So therefore our hypothesis is right.

Group E period 3- Jason Mango, Ria Teitelbaum, Eleni C, Chris Aresco

Purpose- Our purpose in this experiment is to see how much dissolved oxygen is in the water. We are finding it because we want to see if the water can support life, and how much life. If the dissolved oxygen level is a 5-6, then it can support a good amount of life.

Hypothesis- We think that the oxgen level in the water is about 7 to 8 ppm. This is because we can see life (fish, bugs, insects, and worms).

Prediction- If we see a good amount of life in the stream, and we test the water sample by using the instructions provided, then the oxygen level should be around 7-8.

Materials- Water sampling bottle, test tube, titrater, manganous sulfate, alkaline potassium iodid azide, sulfuric acid powder, sodium thiosulfate, water sample, bucket, starch indicator, pencil, and paper.

Procedure- -Submerge sampling bottle in water (no air bubbles) - manganese sulfate 8 drops in water. Cap immediately -8 drops of alkaline potassium iodide azide (invert and exvert continually) -8 drops of sulfaric acid after the bottle settles (particles set on bottom) -Pour sample 20mL into test tube. Insert titrater into the top of sodium thiosulfate. - invert slowly. -Pull plunger out of titrater slowly, make sure no air bubbles. - turn bottle over -put the liquid in titrate into tube cap. -8 drops of starch indicator. Every drop, you swirl the bottom in a circular motion. -Add every thing the titrator sparingly, and every 1/4, swirl. -Stop once solution is completely clear. -Where ever the ring is (on the titrater) will be how much oxygen is in the water.

Conclusion- We had 8.6ppm as our result. This means that the river can support life, but only certain types of species.

**__ Purpose: __** To see if there is an adequate amount of oxygen in our local water source to sustain life. Our goal is to find out if the river is healthy to our standards using this test. **__ Hypothesis: __** We think there is an adequate amount of oxygen to allow life to survive. This is above a level of 3 ppm, because there must at least 3 ppm to sustain life. **__ Prediction: __** If there is enough oxygen in the water around 3 ppm, and we complete a dissolved oxygen test, then we will get a score above 3. **__Materials:__** collection bottles, test tubes, manganous sulfate solution, alkaline potassium iodide azide sulfuric acid, tritator/plunger, sodium thiosulfate, starch indicator solution, protective gear (goggles, apron, and gloves) **__ Procedure: __** 1. Collecting the water sample following procedures in testing manual. 9. After titration is complete read the test results directly from the scale where the large rail and the titrator meet the titrator barrel **__ Data: __** River Water: 8.6 **__PPM +/- .05 ppm__** **__ Conclusion: __** The test supported our hypothesis, there is an adequate amount of oxygen to allow life to survive, and there should be a level above 3 ppm. There must at least 3 ppm to sustain life. The level of oxygen in our river, 8.6 ppm, is high enough to support a great deal of life like fish and other organisms. Our uncertainty was +/- .05, but if we did make a mistake, the level of oxgen would still be high. We knew some oxygen would be present, but we were surprised by the actual amount we found. According to the dissolved oxygen scale, the water is able to sustain high levels of life. We are going to keep our hypothesis the way it is.
 * __ Dissolved Oxygen Experiment- group F, period 3, Chris Isabella Luke and Stacy  __**
 * 1)  Remove the cap from the bottle.
 * 2)  Immediately add 8 drops of ***Manganous** Sulfate solution (4167) **and** Add 8 drops of ***Alkaline** Potassium Iodide Azide (7166).
 * 3)  Cap and the bottle to mix by inverting several times. A precipitate will from.
 * 4)  Allow the precipitate to settle below the shoulder of the bottle.
 * 5)  Add 8 drops of ***Sulfuric** Acid, 1:1 (6141WT).
 * 6)  Cap and gently invert the bottle to mix the contents until the precipitate and the reagent have totally dissolved.
 * 7)  Following titration procedures from manual.


 * Period 6, Group C: Jocelyn, Stephanie, and Alex**

Materials: Magnism Sulfate Lodate Azide Acid Surenge

Hypothesis: We think that there is a lot of dissovled oxygen in the Passaic River.

Prediction: If we do the desolved oxygen test and our results show that there is an unhealthy amount of ppm's then the Passaic River is unhealthy.

Procedure: 1. Ad 8 drops of magnism sulfate. 2. Stir it up for a least a minute. 3. Add 8 drops of lodate azide. 4. Stir it up for a least a minute and let it settle until its below the shoulders of the bottle. 5. Add 8 drops of acid. 6. Cap quickly then mix up until it's a yellow to orange color. 7. Insert the surenge into sulfer. 8. Make sure there are no air bubbles.

Data: We had 8.0 ppm of oxygen after the experiment.

Conclusion: By the end of our experiment we found out that there was 8.0 ppm of disolved oxygen. It supported our hypothesis that there was a lot of oxygen in the Passaic River.