Subject: help needed on solubility

I am doing my GCSE chemistry coursework and I am having difficulty with it 
and I was wondering if you could please help me.

The aim of the coursework is to:
...discover which salt is more soluble; zinc sulphate, calcium chloride, 
copper sulphate or sodium chloride.  The temperature of the water and its 
relation to the salts will also be investigated.

I have to do a prediction before I begin the experiment, and I am having 
difficulty obtaining information.  I think it has something to do with Ksp 
but I have no idea what this is and where you can find the information.  
How can you find out which one will be more soluble?  Also, how does the 
temperature affect solubility in this instance?

Any help you can give me is very, very, VERY much appreciated

Re: help needed on solubility