KV+Study+Guide+Dissolved+Oxygen

=Project Search Study Guide= Water Test: Dissolved Oxygen

1.) How does dissolved oxygen get into the water? --> One way is through the process of photosynthesis in aquatic plant life. The other is through diffusion of oxygen in the air at the surface.

2.) Why is it important to the ecosystem? --> Fish and other aquatic animals use oxygen gas, that has been dissolved in water, to breathe.

3.) How do humans impact the levels of Dissolved Oxygen? --> Human factors that effect the levels of dissolved oxygen are the addition of sewage wastes and fertilizers

4.) What does it mean to fix the oxygen? Why did we need to do this? --> Test the water and come up with a ph level

5.) What are some of the precautions you need to take in this lab? --> Use good ventilation. Flush with water if come on contact with skin, if in eyes, flush with water and consult a physician. Use gloves and eye protection.

6.) What is titration? --> slowly adding a measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete; the concentration of the unknown solution (the titer) can then be calculated.

7.) How do you read a direct reading titrator? -->Read the testresult 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 totalamountsof titrant used todetermine the final testresult.