1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Reaction Rate Experiment - Concentration

  1. Feb 8, 2010 #1
    Solution A: is a dilute soultion of potassium iodate, KIO3 which is the source of iodate, IO2(1-)
    Solution B: contains some starch and the other reacting species, the hydrogen sulfite ion, HSO3(1-)

    1. In a small beaker obtain about 50mL of solution A (0.02 M IO3(-)) and in another small beaker obtain about 70mL of soulition B (HSO3(-))

    Trial - Contents of Test tube 1 - Contents of Test Tube 2 - Time (s) - Concentraion IO3(-)

    1 10.0mL A + 0mL water 10.0 mL B 6.9 (my guess 0.02)
    2 9.0 mL A + 1mL water 10.0 mL B 8.5 (my guess 0.018)
    3 8.0 mL A + 2mL water 10.0mL B 9.1 (my guess 0.016)

    - My question is, am I getting the concentration right? I don't think I am and I am not sure how to figure it out.

    My friend with the same lab results said he got:
    1. 0.01
    2. 0.09
    3. 0.08

    so basiclaly what I got divide by 2

    Please help me out

  2. jcsd
  3. Feb 9, 2010 #2


    User Avatar

    Staff: Mentor

    There is nothing to guess here - concentration can be calculated. And obviously your friend is better in these calculations :wink:
    Last edited by a moderator: Aug 13, 2013
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook