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How to Calculate Ka from pKa.
Chemistry

How to Calculate Ka from pKa.

Rosemary Njeri

Ka is the acid dissociation constant while Kpa is simply the negative logarithm of Ka.

The dissociation constant for a strong acid can be as high as 10^7 while for a weak acid it can be as low as 10^-12.

pKa is expressed as a common logarithm (base 10) and not as a natural logarithm (base e).

Formula to calculate Ka from pKa.

Calculate Ka from pKa.

Example:

Suppose the pKa is 7. Calculate the Ka.

Calculate Ka from pKa.

Therefore, the Ka is 10^ -7. This means that this is a strong acid.

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