Biology/Chemistry Summative (0 comments)
Posted by cassidy wilson on November 22, 2007
Single test tube:Negative- indicator remains yellow(positive)-was sitting for 60h not 48Positive-many gas bubbles present-gel floats on top-color of gell and liquid are the sameDissolved Oxygen Reaction:negative-did not have a small test tube therefore much oxygen is present-bad results(5ppm)positive-both tablets were added st the same time-mixed slowly so there weren't many oxygen bubbles.Biochemical Oxygen Demand:negative-2ppm fair results-test tube was not full to the toppositive-exact amount of days before testing.Phophate Reaction:negative-did not wait 5 minutes-mixed very quickly many air bubbles presentpositive-4ppm(score of 2;fair results).Nitrate Reaction:negative-waited more than 5 minutespositive-oppm-score of 4 excellent test results.pH Reaction:negative-only filled the test tube to 5mLpositive-8 on the pH scale-score of 3(good results)
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