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okay, so you always start of with an hypothesis; ours could be: we believe that the lower the pH the more sour the pine drink will taste,
the pH and time are related so we would measure both. we know that if it's sour then there's bound to be acid in there. we measure the pH after say maybe intervals of five minutes.
alright...got it. Where does the ethanoic acid come in all of this?
it's believed that the ethanoic acid is the cause of the sourness.
we need to first figure out whether the drink tastes sour and whether that relates to a lower pH or not
this is a stretch but after we do that we could easily say maybe identify the compound by some type of spectroscopy
I'm trying to make sense out of all this but i'm failing quite miserably. I understand that the longer the pine drink is out, left uncovered, the more ethanoic acid will be fermented. Now, where is this CH3COOH coming from? since the pH and time is related, i'll have to provide a discussion and my control, responding and manipulated variable and just thinking about it makes me want to stare at the wall.
Also, is it wise to include a control? say, one is uncovered and the other, covered?
that's interesting. it wasn't really mentioned yeah great observation though. there could be some reaction occurring, but I think a control would be maybe you have two groups right? one you introduce ethnanoic acid into the drink, and then measure the pH change and sourness over time. the second group you just leave the drink out and do the same thing.
@kym02 I assume that the ethanoic acid forms, by some kind of reaction, due to it sitting out longer. maybe carbon dioxide is being absorbed into the solution, that's a stretch but hmm.. the idea is that acid is forming the longer you keep it out. but the thing is @kym02 we dont know if there's acid in there to begin with. that's why I suggested introducing ethnoic acid into the drink for a second group and seeing what happens.
And that's what was bugging me. At first, I assumed that there was an acetic acid bacteria that converts ethanol to acetic acid in the presence of oxygen (the uncovered pine drink) but the thing is, where does the ethanol come from?
I think maybe for the purposes of this experiment you're just suppose to determine whether there's acid in there.
reason why I said to put ethnoic acid into one group and leave the other one dormant is to check to see if some other medium is required other than just leaving it out.
Alright, that will definitely work then. If that way is done, what exactly are the materials/ apparatus that should be used. That's all i need to know in terms of clearing everything up in my head.
|dw:1444015490884:dw| or |dw:1444015592681:dw|
I honestly can't see the words at the end :s they were cut short.
oh, it's better now.
have a computer that measures the pH in certain time intervals, then you could just take a small bit of the solution out and taste it to determine sourness.
alright, Thanks a bunch for your help!
also, is there any sort of limitation or sources of error? *_*
I guess it's like how do you measure sourness that's a big limitation that's more qualitative that quantitate.
well that's more of a limitation than a source of error
okay. Thanks you very much, once again ^_^