MS20 Laboratory: Physical and Biological Factors Affecting Oxygen ...
MS20 Laboratory: Physical and Biological Factors Affecting Oxygen ...
MS20 Laboratory: Physical and Biological Factors Affecting Oxygen ...
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Name__________________ Lab Section_______________ Date________<br />
ANSWER SHEET <strong>Oxygen</strong> Lab<br />
Table Two<br />
Calibration water temp theoretical oxygen starting point ending point mLs of<br />
thiosulfate used<br />
1 st run<br />
2 nd run<br />
Average =<br />
Calculate your unknown concentrations using the average mls of thiosulfate from Table Two <strong>and</strong><br />
the known oxygen concentration from Table One in this equation:<br />
unknown O 2 concentration = known O 2 concentration x mL thiosulfate used for unknown / ml thiosulfate for known<br />
6. Determine the oxygen content of sample 2: 35 o / oo salinity water, room temperature.<br />
milliliters of thiosulfate solution calculate 0 2<br />
7. Determine the oxygen content of sample 3: polluted lake environment.<br />
milliliters of thiosulfate solution calculate 0 2<br />
8. Determine the oxygen content of sample 4: model lake – surface sample.<br />
milliliters of thiosulfate solution calculate 0 2<br />
9. Determine the oxygen content of sample 5: model lake - 75 cm down.<br />
milliliters of thiosulfate solution calculate 0 2<br />
10. Determine the oxygen content of sample 6: model lake - bottom.<br />
milliliters of thiosulfate solution calculate 0 2<br />
Answer the following questions:<br />
1. Assume you misread your buret end point <strong>and</strong> added too much thiosulfate solution for your<br />
st<strong>and</strong>ard. How would this affect all of your other results?<br />
<strong>MS20</strong> Lab <strong>Oxygen</strong> rev.3/27/2005 Page 14 of 16
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