What does pka mean in university medical chemistry?

PKa is the negative logarithm of ionization constant. In this question:

pka=-lg 1.75* 10^-8=4.75

In chemical calculation, p represents the negative logarithm of a value. For example, PH is the negative logarithm of hydrogen ion concentration, POH is the negative logarithm of hydroxide ion concentration, and so on.

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