Find Ka from pH.

Understand the Problem

The question is asking how to find the acid dissociation constant (Ka) from a given pH value. This typically involves using the relationship between pH and the concentration of hydronium ions [H3O+] to calculate Ka for a weak acid.

Answer

Ka = ([H⁺][A⁻]) / [HA]

To find Ka given the pH, use the formula Ka = ([H⁺][A⁻]) / [HA]

Answer for screen readers

To find Ka given the pH, use the formula Ka = ([H⁺][A⁻]) / [HA]

More Information

The steps involve calculating the [H⁺] concentration from the pH, assuming that [H⁺] = [A⁻], and substituting the values back into the Ka expression.

Tips

Ensure the solution is indeed a weak acid and that the assumptions made (such as negligible change in initial concentration of HA) are valid.

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