Ok i think i might do "Which water body is safest to swim in, in terms of water quality/pH level?" And i would test the water pH level in 3 home swimming pools (to be fair as different home pools will probably be different), a public pool (Sans Souci Leisure Centre), Wooronora River, Kogarah Bay and Cronulla beach. To ensure it is a fair test i would test them all on the same day and it would all be within an hour of each other to ensure that it is the same conditions for allof them (such as weather,temperature and date etc) i would repeat the experiment numerous times to ensure a fair test. The independent variable would be the location/type of water body and the dependent variable would be the pH level of the water body.
I would just like to thank Laura not from school who helped me IMMENSLEY in coming up with this idea and must credit her for hr help.
I would conduct this experiment by going to each of these locations and collecting equal amounts of samples of the water. From here i have two possibilities; Laura has bought a special pH strip which you place in the water you want to test and then match the results with the numbers on the box which tells you what the pH level is. However i realise this might not count as normal household equipment so if i am not allowed to do this then i can use red cabbage to test the pH level (once again thank you to laura for suggesting cabbage when i asked if there was any food that i would be able to use). I would be able to measure the pH level by cutting up and boiling the cabbage in distilled water to extract the Flavin (how technical of me! basically flavin is an antioxidant that naturally occurs in cabbage and can be used as a pH indicator because it changes colour in different concerntrations of Hydrogen ions). I would then use this as the indicator and add to a sample of the water i am testing and find a reliable online chart to compare my results to and determine the pH level of that water sample. I would make sure i use equal amounts of the indicator on each sample to keep my experiment fair.
I have not run this idea by my science teacher yet as she has gone on YEAR 7 CAMP :O and i was not organised to decide on this idea before she left so my srp experiment may change it all depends on what Ms Zhang thinks of this idea!
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HEY STEPH :)
ReplyDeletedont get excited, im not miss zhang.
BUT, in my opinion this looks like a really clever idea. youre a lot more game then me, seems complicated. hopefully miss zhang will approve :)
also, i just saw your comment asking me to look at your blog to check it works- IT WORKS. hahah sorry it took so long to notice that,
love you x x x
Steph, very nice idea. My only concern about it is that it's not very scientific. Remember how we looked at the differences between an experiment and a demonstration (i.e. a demo is more of a "let's do this and see what happens", rather than a true scientific experiment). There is also a lot more to swimmability (is that a word?) of water than just pH...
ReplyDeleteSo, whilst it is an okay starting point, you need to consider a lot more stuff than what you have here... make sure you think more about what you can do- just a little more depth.