Posted by ryan on Sunday, May 13, 2012 at 4:54pm.
Convert pH to (H^+). That's approximately 5E-3.
............H3PO4 ==> H^+ + H2PO4^-
I.........0.0086 M....0.......0
C...........-x........x........x
E.....0.0086-x........x........x
The problem tells you x = (H^+) = (approximately) 5E-3
Plug that in for x (into the Ka expression) and solve for Ka.
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