# Very weird problem here

1. Nov 27, 2004

### apchemstudent

Very weird problem here....

Problem solved... nm thanks for your help though...

Last edited: Nov 28, 2004
2. Nov 27, 2004

### so-crates

Theres your first problem. Polyprotic acids don't disassociate all at once. The correct reaction would be
$$H_2SO_4 \longrightarrow H^+ + HSO_4^-\ \ \ K_a = high$$
$$HSO_4^- \longrightarrow H^+ + SO_4^{2-}\ \ \ K_a = a\ lot\ less$$

Last edited: Nov 27, 2004
3. Nov 27, 2004

### apchemstudent

Ya, i think my teacher wants to pretend it dissociates completely. However though, that still won't solve my problem. If we pretend only 1 H+ dissociates we have 0.105 moles of H+

(.105 - .075)/3 does not equal .105/4

4. Nov 28, 2004

### so-crates

Could you state the exact wording of the problem? What you wrote is rather confusing.

5. Nov 28, 2004

### chem_tr

Yes, apchemstudent, please write the exact wording and we will discuss it. It is good that you've made much effort to solve it, and maybe we'll see a little point you may have forgotten.

Last edited: Nov 28, 2004
6. Nov 28, 2004

### apchemstudent

figured out the mistake....

Last edited: Nov 28, 2004