[_cheers]

A mixed aqueous solution of HCl and arsenic acid (H3AsO4; Ka1 = 4.90×10-3; Ka2 = 8.90×10-8) is titrated with 0.1000-M NaOH.
The first end point (ethyl orange indicator) is reached after 44.51 mL of NaOH has been added.
The second end point (thymolphthalein indicator) is reached after a total of 64.29 mL of NaOH has been added.

What quantity of HCl (units of mol or mmol) was present in the initial mixture?



What quantity of arsenic acid (units of mol or mmol) was present in the initial mixture?

[Borek]

Being a member for so long you already should know the rules - you have to try first.

[_cheers]

i have. i didnt post what i did is all. sheesh.