# What is the K value for this reaction?

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 $$1.0\times10^{14}$$?

• 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. – andselisk Feb 6 at 20:25
• $K_{\mathrm{w}}^{-1}$ seems right to me. – Zhe Feb 6 at 20:28