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w3390
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Homework Statement
Calculate the pH of 20.00 mL of 0.20 M KHP.
Given: pKa1(H2P)= 2.950 pKa2(H2P)= 5.408
Homework Equations
k = [H][P]/[HP]
The Attempt at a Solution
I used this equation and got:
3.91e-6 = [x][x]/[.2]
x^2 = 7.82e-7
x = 8.8e-4 = [H]
pH = 3.05
However, my homework is telling me this is incorrect. Is it just a rounding issue or is it something else? Any help is much appreciated.