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When asked to predict whether the equilibrium constant reaction is greater than or smaller than 1,...

When asked to predict whether the equilibrium constant reaction is greater than or smaller than 1, how do you determine what is a stronger/weaker acid and stronger/weaker base?

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Answer #1

For stronger weak or bases, the dissociation is 100 %, that means that it remains in ionic form. But for weaker acid or bases, they are not 100 % dissociated. They remain in molecular form also along with ionic form. For example, if we take HCl, it is a strong acid, so it remains in H+ and Cl- form. But for HCN, which is a weak acid, is not completely dissociated as H+ and CN-. The equilibrium constant is ratio of concentration of products to reactants. If the weaker acid and bases do not undergo complete dissociation, so, numerator will be less than denominator for equilibrium constant. Thus it would be less than 1.

But for strong acids and bases, the numerator is greater than denominator, thus equilibrium constant is more than 1.

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