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So far, maybe it's just that my course isn't advanced enough, but I have never seen anything called 'neutralization constant'.

Any such reaction involving an acid and a base will be complete no matter the strength of either reactant.

Buffer works the same way. If the reaction is reversible then the buffet is not effective.

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  • $\begingroup$ I imagine by "neutralization constant" you mean the inverse of the autoionization constant. For water that would mean $\ce{H^+ + OH^- -> H2O},\ \ K=1.0 \times 10^{14}$. This massive constant is why even weak acids or bases completely dissociate and react when faced against a strong base or acid, respectively. $\endgroup$ Mar 16 '15 at 0:59
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The reverse reaction of neutralization is called hydrolysis ( X salt + H2O = acid + base )

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  • $\begingroup$ But that's if you start with water and salt $\endgroup$ Mar 15 '15 at 21:39
  • $\begingroup$ Hmm then i guess i don't understand the question. $\endgroup$ Mar 15 '15 at 22:02
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    $\begingroup$ I tried again to understand the question hahah and i hope this time I'll help.It's not that any of these reactions will be complete and it depends on the strength of either reactant.Neutralisation between an acid and a base either of which or both are weak will be a reversible reaction which means that it is not complete, on the other hand strong acid a bases in neutralisation will be complete and it will be a ireversible reaction. $\endgroup$ Mar 15 '15 at 22:15
  • $\begingroup$ It doesn't matter if you start with pure salt - reaction is the same. $\endgroup$
    – Mithoron
    Mar 15 '15 at 23:07
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In general under normal conditions of temperature and pressure the reverse reaction of the neutralization is not possible because of their (acids & bases) tendency (release of H+ ion & OH- ion) to form salt water due to which there is no any constant so called "neutralization constant"

But as for the consideration, the reverse of the neutralization reaction is called hydrolysis. In a hydrolysis reaction a salt reacts with water to yield the acid or base: BA + H2O → HA + BOH

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