# How do you write the chemical equation for the acid-ionization equilibrium of acetic acid in water?

Feb 27, 2017

${\text{H"_3"CCO"_2"H(aq)" + "H"_2"O(l)" rightleftharpoons"H"_3"CCO"_2^(-) + "H"_3"O}}^{+}$
We write "K"_a=(["H"_3"O"^+][""^(-)"OAc"])/(["HOAc"]), ("HOAc"-="HO(O=)CCH"_3), and under standard conditions, ${\text{K}}_{a} = 1.74 \times {10}^{-} 5$.