[Meowmix88]

Arginine (C6H14N4O2) is an aminoacid that can be considered as the single
protonated form (HA) of a triprotic acid (H3A2+, H2A+, HA, A-, where HA is
arginine). The structure is shown with acidic protons in blue. If pKa1 = 1.823, pKa2
= 8.991, and pKa3 = 12.1.


If 100.00 mL of a 0.100M solution of the base A- are titrated with a 0.200 M
solution of HCl, calculate (a) the equivalence volume, and the pH at the following
points of the titration: (b) 0.00 mL of HCl, (c) 25.00 mL of HCl, (d) 50.00 mL
(HCl), (e) 85.00 mL of HCl, (f) 100.00 mL, (g) 125.00 mL, (h) 150.00 mL, (i)
175.00 mL

[Meowmix88]

can anyone just gimme a general direction to go in?

[Borek]

What happens when you dissolve the arginine?

What happens when you add strong acid?

Try to write all reactions and assign pH ranges to them.