Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hey

    Plz can anyone explain why transition metal ions are coloured in a simple way as the book is making it tooo confusing......thanx and also most ligands which maybe tested in edexcel will either be Ammonia,Water or Chloride Ions?? they r most common...
    Offline

    2
    ReputationRep:
    It's usually always ammonia. Learn the ammonia added to hexaaquacopperII thing. always a good one to know.

    Transition metals have incomplete 3d subshells - looks at the middle section of the period table - this covers Sc to Zn
    The 5 suborbitals are split into a 3 and a 2, these 2 are slightly higher energy states than the 3. Each sub orbital can fit two electrons in.
    White light is shone through a solution of transition metal ions. Electrons are excited from one of the lower 3 suborbitals to one of the higher 2 suborbitals. The energy has been absorbed. The energy change is quantised (a specific change) and "E=hf", so the frequency can be found.
    White light is a mixtureof all frequencies of visible light. If some of these frequencies are absorbed in this electron exciting way, the rest can pass through and be seen. It is this mixture of unabsorbed frequencies which gives the resultant colour.

    E: change in energy
    h: Planck constant
    f: frequency

    f=c/l

    c: speed of light, 3x10^8m/s
    l: wavelength

    Hope this helps
 
 
 
Poll
Do you want your parents to be with you when you collect your A-level results?

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.