pH and pka

relationship between % protonated and % deprotonated

pH 3 units more than pka

0.1% protonated / 99.9% deprotonated

pH 2 units more than pka

1% protonated / 99% deprotonated

pH unit 1 more than pka

10% protonated / 90% deprotonated

ph = pka

50% protonated / 50% deprotonated

pH unit 1 less than pka

90% protonated / 10% deprotonated

pH unit 2 less than pka

99% protonated / 1% deprotonated

pH unit 3 less than pka

99.9% protonated / 0.1% deprotonated