thanks a lots for your previous reply...
I have already downloaded your BATE and tried working the same compounds( KH2PO4) in it, however, I got pH = 4.07 for 0.11565M concentration. This value is pretty off from the experimental results pf 4.5 . I was kinda wondering , like did u guys considered the activity coefficient of all the ions in the software ?? Because after considering the activity coefficient of the pH my answer comes like 4.35 which is much closer to experimental result 4.5
I have computed the activity coef of these ions by using debye-huckel equation. Kindly guide me if the approach is correct ? then computed the other ka which is used for the actual calculation.
I really cant figure out why the pH(exp) of KH2PO4 and NH4H2PO4 are different for same concentration of correspoding salts. ?? because i was really confused, i performed the lab again doing the same thing but i got the same results. Mathemethically, I got the same answer for the NH4H2PO4 pH as KH2PO4, if I were to neglect the effect of NH4+. which is quite obvious. ..
the reference you provided was extremely helpful thanks a lot for that. It helps me a lot in carrying calculations. But I cant really find the actually calculation of KH2PO4. I got the one with phophoric acid..which takes H3PO4 + H2O ---------------- H2PO(-) + H30(+) in account .. which i think i dunt need it. because my salts dissociated directly into H2PO(-) ion
. Also the Ka value of this predominate the actually caluclations..
Finally, Also my ultimate aim is to mix all different salts and then have to determine the ionic species at different pHs in a container mathemetically. I can name some of the important salts in the container.. 1) NH4H2PO4, MgSO4, NaCl, CaCl2 and so on.. I will be thankfull to you if you can also guide me about the approach to be taken to complete this query. Hoping for your favorable response again..
Thanks a lots
Ashmit