How do I calculate the pka of H2Se?
- pisgahchemistLv 76 months ago
H2Se pKa .....
The obvious, which hardly deserves a post on YA, is to look up Ka of H2Se and take the "negative log". Keep in mind that there are two Ka's and two pKa's, although the second one is negligible.
Or it can be done experimentally. Use a pH meter to find the H+ ion concentration of a known concentration of H2Se.
H2Se(aq) <==> H+ + HSe^-
[H+] = 10^-pH
Ka = [H+][HSe-] / [H2Se] = [H+]²/[H2Se]
pKa = -log([H+]²/[H2Se])
- Old Science GuyLv 76 months ago
look up the Ka for H2Se
I found Ka = 1.3E-4
pKa = -log Ka = -log1.3E-4 = 3.89
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- davidLv 76 months ago
usually a problem will give you a certain concentration of the acid. H2Se, and the pH of that solution. When you know those you can use the formula to calculate pKa
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- Anonymous6 months ago
You need some data.