Chem Questions :(

[psychlaw]

These are the non-equation questions which I really hate. And here are the ones im having trouble with =/ probably easy but can't find anything in the textbook on it...

(1) If you wished to remove the copper ions from a particular solution, what is one simple experimental procedure you could use?

(2) If you wished to speed up the settling of a precipitate, what piece of labratory apparatus could you use?

thanks guys

[Collin Li]

(1) Electrolysis to reduce copper ions into copper solid.
(2) An ice-water bath to reduce the temperature, and hence speed up the rate of crystallisation and preciptation.

There may be other answers, but these are the ones I thought of first.

[psychlaw]

Thanks mate

If the labels on a bottle of aluminium chloride and a bottle of ammonium chloride were obscured, what quick test could you perform to tell which was which?

also

Discuss if someone could do this one question as an example, it would be great so I could do the other 5 , cause I have no clue where to start

Discuss whether a precipitate could form if your were to mix:  (a) copper (II) sulfate solution with cobalt sulfate solution

[Mao]

If the labels on a bottle of aluminium chloride and a bottle of ammonium chloride were obscured, what quick test could you perform to tell which was which?

add some strong acid. ammonia would be produced (acid-base reaction), which is a gas in normal lab environments. aluminium chloride wouldn't react.

Discuss whether a precipitate could form if your were to mix:  (a) copper (II) sulfate solution with cobalt sulfate solution

no.

when these are mixed, there will be two species of cations: copper (II) and cobalt ions, and one anion: sulfate
so the possible combinations are still copper(II) sulfate and cobalt sulfate, neither of which are solid in normal conditions (as already stated in the question)

generally, precipitation reactions only occur when ions from two solutions "cris-cross" [forgot the proper terminology for it]