[Simons2]

Disodium salt of EDTA solution (0.05M) is often used for titration of metal ions. Estimate pH of this solution.


As part of the homework, my professor had said no calculation would be necessary (which doesn't make sense for this problem; to me anyway)... Because EDTA is insoluble in water and in order to dissolve it, the pH level has be 8, I'm assuming the pH for the solution would also be 8?

[AWK]

This pure compound in solution shows pH ~4.5. Solubility at RT is about 100 g/L (0.26 mole).
pH=8 concerns alkalized disodium salt.

[Borek]

"No calculations" is not exactly true, but - as with many amphiprotic salts - average of both pKa values involved (that is, the last neutralized proton, and the first non-neutralized proton) will give a good estimate of what to expect.

Check if it fits the information posted by AWK.