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2002 Chem Q1 bleach titration answers anyone?

  • 04-06-2008 9:11pm
    #1
    andrew
    Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 3,373 Mod ✭✭✭✭


    2001! i mean 2001! Does anyone have any answers for the 2001 Q1 sample paper question on bleach? Why, for example, is the bleach diluted!?

    Thanks


Comments

  • #2
    Parsley
    Closed Accounts Posts: 3,144 ✭✭✭Parsley


    Diluted because otherwise an excessive amount of reagents would be used up in the reaction.


  • #3
    cHaTbOx
    Registered Users, Registered Users 2 Posts: 8,011 ✭✭✭cHaTbOx


    What past papers do you have ?
    Folens page 9


  • #4
    cHaTbOx
    Registered Users, Registered Users 2 Posts: 8,011 ✭✭✭cHaTbOx


    Parsley wrote: »
    http://www.examinations.ie/archive/markingschemes/2002/LC022ALP1EV.pdf

    wants the sample question.


  • #5
    andrew
    Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 3,373 Mod ✭✭✭✭andrew


    feck i meant 2001! i have edco papers. thanks for ethanoic acid one, needed that too


  • #6
    Parsley
    Closed Accounts Posts: 3,144 ✭✭✭Parsley


    My papers are all the way upstairs, post the questions here and I'll answer em! :P


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  • #7
    BJC
    Registered Users, Registered Users 2 Posts: 731 ✭✭✭BJC


    My cousin helped write the chemistry exam this year, He would have told me what to expect I reckon but I don't do chem...should have got the info and sold it to you all...ah well...happy learning :p


  • #8
    andrew
    Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 3,373 Mod ✭✭✭✭andrew


    i mainly just wanted to know why bleach was diluted. it was a lil question that was wrecking my head. also, what apparatus is used to add 10cm3 of potassium iodide and 20cm3 of sulfuric acid to conical flask? Pipette?


  • #9
    mike-gunners
    Closed Accounts Posts: 33 ✭mike-gunners


    andrew wrote: »
    2001! i mean 2001! Does anyone have any answers for the 2001 Q1 sample paper question on bleach? Why, for example, is the bleach diluted!?

    Thanks
    bleach is diluted for 2 reasons:
    1.in order to use larger volumes in reactions so that the percentage error is reduced.
    2.so that less reagents are used since bleach is very strong.


  • #10
    Parsley
    Closed Accounts Posts: 3,144 ✭✭✭Parsley


    andrew wrote: »
    i mainly just wanted to know why bleach was diluted. it was a lil question that was wrecking my head. also, what apparatus is used to add 10cm3 of potassium iodide and 20cm3 of sulfuric acid to conical flask? Pipette?

    Small graduated cylinders!


  • #11
    mike-gunners
    Closed Accounts Posts: 33 ✭mike-gunners


    andrew wrote: »
    i mainly just wanted to know why bleach was diluted. it was a lil question that was wrecking my head. also, what apparatus is used to add 10cm3 of potassium iodide and 20cm3 of sulfuric acid to conical flask? Pipette?
    to add potassium iodide and sulfuric acid, use a graduated cylinder.


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  • #12
    Michellenman
    Registered Users, Registered Users 2 Posts: 11,195 ✭✭✭✭Michellenman


    andrew wrote: »
    2001! i mean 2001! Does anyone have any answers for the 2001 Q1 sample paper question on bleach? Why, for example, is the bleach diluted!?

    Thanks



    The bleach is diluted because otherwise the concentrations are too strong and an accurate end point would not be detectable.


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