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Biology I 2010 Per 23 Catalase Lab Design

Page history last edited by De 13 years, 9 months ago

What are some of the mistakes you made during your last lab?


How can you efficiently use your time to answer the question posed?

How many times must you do each trial in order to be able to present it to me?

Comments (14)

stephen said

at 10:40 pm on Feb 16, 2010

some mistakes we made were not testing each Ph multiple times with the potatoes,not recording each result, and didnt choose every Ph (we only used Ph 14, 7, 3, and 1 i believe).
To make this efficient we should set up a chart with the Ph's we used and how long it took to make the paper rise to the surface. Everyone can test a Ph and then test a buddies Ph for more accurate results.We should try each test at least 3 times for the most accurate results and have it recored on a peice of paper.

De said

at 11:41 pm on Feb 16, 2010

You guys can set the chart up here. This is a resouce for you. Just hit the edit tab in the top left corner.


at 11:41 am on Feb 17, 2010

Does anyone know if we need to test pH0 or pH -1?

Moreilly said

at 11:45 am on Feb 17, 2010


According to this picture from Wikipedia, they both exist.

Also we should talk about the last question : "How many times must you do each trial in order to be able to present it to me?"
Personally I think three tests would be enough, but what do you guys think?


at 11:56 am on Feb 17, 2010

I think 3 trials is enough but I am concerned about the amount of time we have. We have only one class period. How many peoplewill be available 7th period so we could continue the lab then?

maluccio@... said

at 10:31 pm on Feb 17, 2010

people, if i recall correctly, the use of acids and bases was not a reliable way to test, therefore we should use salt. all i know is that salt can change the structure of a protein differently than an acid/base and other classes are voting to do so.

maluccio@... said

at 10:32 pm on Feb 17, 2010

well, i know a little more about how the salt can change a protein but...


at 7:32 pm on Feb 18, 2010

Hey guys, I think that we should do pH for the lab tomorrow and each of the two groups does 7 pH each. Make sure you comment so we have a plan for the lab tomorrow.

Moreilly said

at 10:55 pm on Feb 18, 2010

I think we should make even smaller groups of like 2 or three people that way we can get all of them done quickly, We should write out a procedure here so everyone can get started right away tomorrow

Naomi Wong said

at 11:13 pm on Feb 18, 2010

everyone check your email

Moreilly said

at 11:27 pm on Feb 18, 2010

Naomi that's simply excellent =D but everyone keep in mind that we should keep as much as we can a constant. so perhaps we should also set the amount of hydrogen peroxide. Preferable it should be something low since the tests may have to be repeated with NEW peroxide, for completely accurate data.

stephen said

at 11:54 pm on Feb 18, 2010

guys i think naomi emailed you all the procedure and what we are doing


at 12:21 am on Feb 19, 2010

Naomi this is really good. Well thought out. We should definitely do groups of two students so that way people are not standing around and not making themselves productive. Amazing job on the procedures Naomi.


at 12:51 am on Feb 19, 2010

Every group must make sure to have a cell phone or a stopwatch with them to record the time of how long it takes the sample to rise.

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