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The neutralization reaction $\ce{H3O+ + OH-->2H2O}$ effectively proceeds to completion but can be expressed using an equilibrium constant (K) just as any other reaction. What is the K value for this reaction?

I'm not too sure but would it just be the inverse of the value of $K_w$ which would equal $1.0\times10^{14}$?

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    $\begingroup$ No, you are not asked for a number at all. You are expected to write down the expression for the equilibrium constant, that's it. By the way, this assignment is composed quite illiterately both contextually and typographically; if it's from some textbook, I'd advise not to use it. $\endgroup$ – andselisk Feb 6 at 20:25
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    $\begingroup$ $K_{\mathrm{w}}^{-1}$ seems right to me. $\endgroup$ – Zhe Feb 6 at 20:28

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