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Every acid has a constant, called the acid dissociation constant(or Ka), which shows how much the acid dissociates to form ions in water.

For an acid, the general dissociation equation is:

HA -------> H+ + A-

Ka = (concentration of H+) times (concentration of A-) divided by (concentration of HA)

The values for concentrations are the values AT EQUILIBRIUM, where the concentrations of all three substances remain the same.

If HA was a strong acid, it would completely(or almost completely) ionize in water to form its ions. Therefore, you can say that the concentration of H+ ions in the solution equal the concentration of HA. From this, you can calculate the pH by using the formula pH = - log (H+).

If HA was a weak acid, however, things would be different. The acid only partially ionize in water, so you cannot say that the concentration of H+ is equal to the concentration of HA.

If you know the value of the acid dissociation constant, you can easily find the concentration of H+ in the solution, and in turn calculate the pH.

You know that the amounts of H+ and A- are equal. If you know the concentration of the acid HA you put in, you can calculate the H+ .

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14y ago

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