As all you chemists know, transition elements can exist in variable oxidation states as ions. Unsurprisingly, there are so many of these; of which most are coloured.
If anyone knows, for the OCR A - A Level Chemistry specification, is it a requirement to memorise all of the ions AND their colours for every transition element in the first row of the d-block?
I've checked the specification and nothing seems to be explictly clarified, here's an extract:
"(c) illustration, using at least two transition
elements, of:
(i) the existence of more than one oxidation
state for each element in its compounds
(see also 5.3.1 k)
(ii) the formation of coloured ions (see also
5.3.1 h, j–k)
(iii) the catalytic behaviour of the elements and
their compounds and their importance in
the manufacture of chemicals by industry
(see 3.2.2 d)
No detail of how colour arises required.
Practical examples of catalytic behaviour include:
Cu2+ for reaction of Zn with acids;
MnO2 for decomposition of H2O2.
No detail of catalytic processes required.
HSW9 Benefits of reduced energy usage; risks from
toxicity of many transition metals."
It seems like way too much to memorise, but I want to be sure that it's what's required to be done for the specifcation before I waste a lot of time trying to memorise them all