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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.
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?
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?
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.
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.
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 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.
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.
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.
BCOSTA said
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
http://upload.wikimedia.org/wikipedia/commons/thumb/4/46/PH_scale.png/350px-PH_scale.png
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?
BCOSTA said
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...
BCOSTA said
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
BCOSTA said
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.
BCOSTA said
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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