Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    http://store.aqa.org.uk/qual/gceasa/...W-QP-JAN08.PDF

    Can somebody help me with question 1c.
    Offline

    1
    ReputationRep:
    (Original post by Master.K)
    http://store.aqa.org.uk/qual/gceasa/...W-QP-JAN08.PDF

    Can somebody help me with question 1c.
    Axes to be labelled as m/z - ie. its mass/charge ratio (horizontal) and something like abundancy of ion (vertical)

    The peak given is Cl 35 +
    So you also need peaks for:
    Cl 37 +
    Cl 35 2+
    Cl 37 2+

    Cl 37 + goes at 37 on the horizontal axis and should be one third the height of the given peak as the 37 istope is one third as abundant as the 35 isotope.

    The peaks for the 2+ ions will much much smaller as it is rare to produce a 2+ ion in a mass spectrometer. They will be at 35/2 and 37/2 on the horizontal axis as having twice the charge they will be deflected more so will act as if they have a smaller mass. Again the peaks should be in the 3:1 height ratio.

    Hope that helps.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Kestrel_Lover_Sophie)
    Axes to be labelled as m/z - ie. its mass/charge ratio (horizontal) and something like abundancy of ion (vertical)

    The peak given is Cl 35 +
    So you also need peaks for:
    Cl 37 +
    Cl 35 2+
    Cl 37 2+

    Cl 37 + goes at 37 on the horizontal axis and should be one third the height of the given peak as the 37 istope is one third as abundant as the 35 isotope.

    The peaks for the 2+ ions will much much smaller as it is rare to produce a 2+ ion in a mass spectrometer. They will be at 35/2 and 37/2 on the horizontal axis as having twice the charge they will be deflected more so will act as if they have a smaller mass. Again the peaks should be in the 3:1 height ratio.

    Hope that helps.
    I get it now

    Rep
 
 
 
Poll
Who is your favourite TV detective?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.