High college Chemistry help » Acid-Base Chemistry » Acids and also Bases » utilizing Base Dissociation constant (Kb)

A 1M solution of a monoprotic acid has a pH the 4.6. What is the 

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 value for the conjugate base of the acid?


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Correct answer:


Explanation:

In stimulate to discover the basic dissociation constant for the conjugate base, we deserve to start by detect the mountain dissociation consistent for the acid. Because a 1M systems of the acid has actually a pH the 4.6, we can uncover the proton concentration of the solution.

You are watching: Which base has the smallest base dissociation constant?

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Since the acid is monoprotic, we can collection the following equilibrium expression equal to its acid dissociation constant.

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We deserve to see that, since the mountain is monoprotic, the concntration that protons will be equal to the concentration that the mountain anion. The final concentration of the mountain molecule will certainly be same to the early stage concentration, minus the lot of proton formed. Using these values, we can solve because that the equilibrium constant for the acid.

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Now the we have actually the mountain dissociation constant, we can find the conjugate base"s dissociation constant by setting the product of the two values same to the autoionization that water.

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