acidic enviro dotpoint (1 Viewer)

[trinity]

What did everyone do for the dotpoint:

perform a first-hand investigation to determine the concentration of a domestic acidic substance using computer based technologies

i don't think we've done it...

thanks alot!

 

[Sammmmmuel]

i ignored that dot point...

 

[jm1234567890]

we stuck a pH probe in detergent, vinigar, etc. and looked at the results.

then played solitare on the computer when the teacher left

 

[trinity]

but is that the pH instead of the concentration of the acid...
you could work out the [H+] from the pH but is that the same as the actual concentration of the acid, as in molarity?

 

[ND]

Ok to determine concentration of acetic acid in vinegar you titrate the vinegar with a strong standard base (like NaOH). Instead of using an indicator however, use a data logger with a pH attachment. Set the logger to do frequent pH checks, and perform the titration (no indicator) until it's gone way past the equivalence point. Now on the graph of pH vs solution added, the equivalence pt will be where the gradient is steepest.

 

[iambored]

we did what ND did

but withough the data logger... we did calculations or something to work it out

 

[thehalford]

Originally posted by jm1234567890
we stuck a pH probe in detergent, vinigar, etc. and looked at the results.

then played solitare on the computer when the teacher left

Heh, forgot about that. Good times for all.

 

[trinity]

thanks guys!