MM+Study+Guide+Dissolved+Oxygen

=Project Search Study Guide= Water Test: Dissolved Oxygen

1.) How does dissolved oxygen get into the water? Dissolved Oxygen gets into the water by air on the surface and from photosynthesis.

2.) Why is it important to the ecosystem? Dissolved Oxygen is important to the ecosystem because aquatic animals use oxygen gas, that has been dissolved in water, to breathe.

3.) How do humans impact the levels of Dissolved Oxygen? Humans impact the levels of Dissolved Oxygen by factors that effect the levels adding to the sewage wastes and fertilizers.

4.) What does it mean to fix the oxygen? Why did we need to do this? To fix the oxygen means to test the water for a pH level. We fix the oxygen to see if the water if safe.

5.) What are some of the precautions you need to take in this lab? Some precautions needed in this lab is that everyone wears safety goggles, and if touching the chemicals to wear gloves. If chemicals do touch skin, then wash off right away.

6.) What is titration? Titration is when you slowly add a measured amount of a solution of unknown concentration and add it to a known volume of a second solution until the reaction between them is just complete. Then the concentration of the unknown solution can then be calculated.

7.) How do you read a direct reading titrator? To read the direct reading titrator you read the test result directly from the scale where the large ring on the Titrator meets the titrator barrel. If the titrator was refilled to reach the final color change, add the total amounts of titrant used to determine the final test result.