[kdog3682]

Say i'm titrating different sport drinks see which is most acidic.

HOw would i set up a experiment?

[english]

You would have to start by finding out what the primary acidic component in what you are analyzing is.

You could run into complications very easily.  Say if there is more than one acidic component in the mixture, such a thing would be quite unmanageable.


You need to do some background checks first. 

After you've gotten that far you would have to obtain reasonable concentrations of the drink, i.e. so the titration would be better.  If it's too concentrated it would take forever to titrate.  Next you would need a standardized or rather well known concentration of some sort of basic solution to serve as your titrant.  This would probably not be easy either.  There are many safety precautions with the decision.
You would also need to find out the pH range that the sample soln. would fall in at the neutralization point.  Then comes choosing an indicator.  In this case you would need an indicator that is basic at the titration end point.  This part's not easy either.   


That's all about I can give.

Good luck.   

[kdog3682]

Ok i have set up a experiment i just have a couple problems.

Materials:
sports drinks
distliled water
burette
pipette
erlenmeyer flask
acid/base indicator
Na2CO3 -

rinse burette w/ Na2co3
Rinse pipette w/ gatorade
rinse flask w/ distliled water
put gatorade into flask via pipette.
fill burette full w/ na2co3
begin titrating slowly
wait until endpoint where color changes completely.
Record values on burette

my problems : how do i choose a ph indicator?  and how do i calculate to find the acidity

[billnotgatez]

http://en.wikipedia.org/wiki/PH_meter

Are you allowed to use an electronic pH meter or is that too simple for the assignment?  Even if you choose to do titration I would do an additional measurement with the electronic equipment for confirmation.

[billnotgatez]

Check out the signature block on this profile

It has pointers to pH information

http://www.chemicalforums.com/index.php?action=profile;user=Borek