1. Salish Sea Science
Surfactants and pH

2. By: Wendy, Monica, Kaitlyn and Kathleen
Background Knowledge
By: Wendy, Monica, Kaitlyn and Kathleen

3. Information the readers should know...
If the pH in the water drops down by a lot that will make a big difference.
There are two types of plankton they are zooplankton and phytoplankton
We used tools that helped us do experiments

4. How does our subject relate to the Puget Sound?
It relates to the Puget Sound because if the pH of the Puget Sound changes that would affect all the research that we get from the Puget Sound
We are the ones who are affecting it and we want to know what we are doing wrong to the Puget Sound
It could also affect us

5. Define key words ( like what is zooplankton?)
pH: the acidity in water
Surfactants: a substance that minimises the surface tension of liquids
Watershed: an area of land where all the surface water drains to a single body of water

6. Question and Prediction
If the surfactants increase then the pH will decrease because the surfactants are affecting the gas exchange.
How does the amount of surfactants affect the pH in water?

7. Variables The manipulated variable was the surfactants.
The responding variable was the pH.
Surfactants and pH are related because we can use the pH scale to see how acidic or basic some soaps are.

9. The Salish Sea
By The Experienced

10. Materials
Colorimeter
Bucketimeter
pH probe
Clip and Rope

11. Methods Around San Juan Islands Ask captain for permission
Dropped bucketo-meter 1 foot into the water
Collect the samples in the bucket
Pull bucket up from water onto the boat
Take samples into separate containers
Tested with the colorimeter and pH probe
Recorded results
Graphed results

12. Data Analysis Station pH Surfactants 1 7.7 1.7 2 7.51 3.3 3 7.83 3.2 4
7.73
2.5 5
3.1 6
7.36
2.8 7
7.94

13. Conclusion
If we are looking at the data points that we currently have, we can see no significant correlation between surfactants and pH.
Our prediction was undecided since we did not have many data points, making it hard to see any significant correlation.

14. Data Analysis Continued
We can see no significant trends in the data, but there is one outlier that we can see (data point 1) and if we draw a line of best fit, there is an upwards incline.