Chemistry, 27.03.2020 21:04 hausofharris

A laboratory experiment was done to show the effects of organic waste on the dissolved oxygen (DO) content in water. Five tanks were set up, each containing fresh water and a small amount of single-celled green algae. Specified amounts of organic waste were added to the tanks. The results below show the amount of DO in each tank after a period of one week.

Tank 1 Tank 2 Tank 3 Tank 4 Tank 5
Initial DO 10 ppm 10 ppm 10 ppm 10 ppm 10 ppm
Amount of organic waste added 0 g 10 g 20 g 30 g 40 g
DO after one week 10 ppm 10 ppm 8 ppm 5 ppm 0 ppm

Which of the following would best improve the validity of the experiment?

Answers: 2

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