Posted: Jan 29, 2016 7:00 pm
What the hell am in forgetting from first year that's preventing me from helping a student with this question?
I feel like such an asshole.
Determine the relative ratio of all four ionic species of histidine at pH 1.8. 1.8 just so happens to be pKa1....
The [A-/HA] for forms A/B, B/C and C/D at pH 1.8 are: 1, 6.31e-5 and 3.16e-8.
Given that 1.8 is pKa1, how the hell does one go from three A-/HA concentrations to a relative ratio of the concentrations of all four ionic species at this pH?
I feel like such an asshole.
Determine the relative ratio of all four ionic species of histidine at pH 1.8. 1.8 just so happens to be pKa1....
The [A-/HA] for forms A/B, B/C and C/D at pH 1.8 are: 1, 6.31e-5 and 3.16e-8.
Given that 1.8 is pKa1, how the hell does one go from three A-/HA concentrations to a relative ratio of the concentrations of all four ionic species at this pH?