C2 Revision question.

I've just gone over the whole C2 specification, using a CGP Additional Science revision guide. There is, however, something I don't understand;

Making insoluble salts- precipitation reactions

The Revision guide states that 'you just need to pick two solutions that contain the ions you need'.

How do you know which solutions you can pick for the specific reaction?
Also, is this all we need to know on this topic (and the fact you have to then filter the salt out etc.)?

Oh and also, do you have to know exactly how Magnesium, Aluminium, Zinc, Iron and Copper react with Dilute HCl? Or do you simply have to know that 'the more reactive the metal, the faster the reaction'?

It's kind of obvious once you know what you're doing, just a neutralization between a suitable acid and , e.g.

Magnesium Hydroxide + Nitric Acid ==> Magnesium Nitrate + Water, can't really explain it better than that

I don't think so, basically more reactive means faster reaction, more vigorous etc.

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