Question on Dissolved Oxygen

timer Asked: Feb 23rd, 2016

Question description

2.  Regarding Phases 2 or 3 of the experiment, if more or fewer drops of Reagent D (sodium hydroxide) were needed to get the same blue color as in Phase 1, what does this tell us about the quality of the water when yeast was consuming nutrients in the water? Did something similar to eutrophication occur?


Further Uses

6.  Now that you’ve seen how decomposition affects the amount of dissolved oxygen, collect three samples from somewhere in your house or community. You can get water from a puddle, a drinking fountain, a stagnant bowl of pet water, a stream, a pond, or fresh rainwater—be creative. Then, see how much dissolved oxygen you find in the sample.




Signs of Decomposition
(List any visible microorganisms that might indicate decomposition.)

Prediction for Dissolved Oxygen Level

Results for Dissolved Oxygen

Your Conclusion
(Would this location support aquatic life?)




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