Hc2h3o2(aq)+h2o(l)⇌h3o+(aq)+c2h3o−2 (aq) kc=1.8×10−5 at 25∘c part a if a solution initially contains 0.260 m hc2h3o2, what is the equilibrium concentration of h3o+ at 25∘c? express your answer using two significant figures.

Answer : The equilibrium concentration of at is, .

Solution : Given,

Equilibrium constant,

Initial concentration of = 0.260 m

Let, the 'x' mol/L of are formed and at same time 'x' mol/L of are also formed.

The equilibrium reaction is,

Initially                0.260 m                       0                 0

At equilibrium    (0.260 - x)                     x                 x

The expression for equilibrium constant for a given reaction is,

Now put all the given values in this expression, we get

By rearranging the terms, we get the value of 'x'.

Therefore, the equilibrium concentration of at is, .

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