Posted: December 16th, 2020

Dissolved Oxygen, questions help

Question description

Lab Report
Answer the questions below. When you are
finished, submit this assignment to your teacher by the due date for full
credit.
Record the number of drops of Reagent D needed to turn the solution
light blue in each phase of the lab:
Set-Up
Observations

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Phase

Amount
of water
mL or drops

Amount
of yeast

1

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6 mL

0.25mL

2

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6 mL

0.25mL

3

6 mL

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0.25mL

1. 
Complete
the data table.
Answer:
Experiment Observations

Phase
1

Phase
2

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Phase
3

O2 concentration in ppm (parts per million)
= number of drops of Reagent D added to reach blue color (oxygen completely
depleted) and observations

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?
Answer:
3. 
What
would happen to the dissolved oxygen in the Missouri River if large amounts of
waste were dumped into it?
Answer:
4. 
Under
favorable conditions, bacteria can multiply every 20 minutes. Starting with one
bacteria cell, how many bacteria should you expect after 15 hours? Hint: Under favorable conditions, if
one bacterium becomes 2 in 20 minutes (1 multiplied by 2), those 2 become 4 in
the next 20 minutes, and then those 4 become 8 in the next 20 minutes.
That means that 8 bacteria resulted in 1 hour. Now calculate the growth of
bacteria for 15 hours.
Answer:
5. 
In
this lab, you continued to add Reagent D to each solution until it turned blue.
The purpose was to remove the oxygen to measure how much was left. The more
drops you had to add to acquire the blue color, the more oxygen was present in
the tube. In which phase(s) did the solution turn blue before you added Reagent D? What do you think that means?
Answer:

Further Uses

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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.
Answer:

Sample

Location

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

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Prediction for Dissolved
Oxygen Level

Results for Dissolved
Oxygen

Your
Conclusion
(Would this location support aquatic life?)

1

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2

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