Diprotic acid- strong base titration (1 Viewer)

[squishyau]

I need to write up a procedure for this titration but I am confused due to it having two equivalence points. Is there any difference in procedure compared to a monoprotic acid? thanks!

 

[squishyau]

bump

 

[hayabusaboston]

typical subjects of top 5 school person lol. anyway i just started on this in chem so sorry not yet acquainted with how it works. But will get soon

 

[iSplicer]

I need to write up a procedure for this titration but I am confused due to it having two equivalence points. Is there any difference in procedure compared to a monoprotic acid? thanks!

You can completely ignore it (for the HSC anyway), as the equilibrium of the second dissociation will be pulled to the right as the titration proceeds, yielding the same amount of protons in the end.

Just make sure you account for this in your calculations (remember your equations!)

 

[squishyau]

so basically as soon as I see the change in colour of the indicator, end the titration?

 

[iSplicer]

so basically as soon as I see the change in colour of the indicator, end the titration?

Yep, treat it as a normal titration, as per usual. As soon as you see a SUSTAINED change in colour, that's it.

 

[squishyau]

awesome, cheers for the help

 

[iSplicer]

awesome, cheers for the help

You can also post your calculations here, I'd be happy to check over them for you.

 

[Kimyia]

Like oxalic acid + sodium hydroxide. Oxalic acid is diprotic so you just need to make sure that in your equation, you show the transfer of 2 hydrogens:
H2C2O4 + 2 NaOH -> Na2C2O4 + 2 H2O

 

[golgo13]

shouldn't be much difference. Just pick a a relatively inidicator and it should be fine