January 21, 2022, 05:35:46 AM
Forum Rules: Read This Before Posting


Topic: End points in strong-base titration of mixed acids  (Read 4562 times)

0 Members and 1 Guest are viewing this topic.

Offline _cheers

  • Regular Member
  • ***
  • Posts: 52
  • Mole Snacks: +0/-0
  • Gender: Female
End points in strong-base titration of mixed acids
« on: November 07, 2009, 09:21:18 PM »
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?
Love is a matter of Chemistry, but sex is a matter
of Physics                                       
- Unknown

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 26919
  • Mole Snacks: +1746/-403
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: End points in strong-base titration of mixed acids
« Reply #1 on: November 08, 2009, 04:23:16 AM »
Being a member for so long you already should know the rules - you have to try first.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline _cheers

  • Regular Member
  • ***
  • Posts: 52
  • Mole Snacks: +0/-0
  • Gender: Female
Re: End points in strong-base titration of mixed acids
« Reply #2 on: November 12, 2009, 12:09:34 AM »
i have. i didnt post what i did is all. sheesh.
Love is a matter of Chemistry, but sex is a matter
of Physics                                       
- Unknown

Sponsored Links