[Taylorb]

I have a question that I cannot solve for the life of me. It is, Caproic acid is found in coconut oil and is used in the making of artificial flavours. A solution is prepared by dissolving 0.14 mol of acid to from 1.50 L of solution. The hydronium acid concentration is 1.1x10^-3 mol/l. Calculate the Ka. Can anyone help?

[Hunter2]

First how is Ka defined.
If you know this which values you know already which one you have to calculate? If you get all of them will in for Ka
.