Yaglaser

Thanks for the replies. It looks as though it will be okay to buy the 12-water, then. I've only managed to find one supplier and the alum comes in a 500g container:eek:

I bought a chemistry set for my sons last weekend and the instructions stated that, to do all the experiments, more copper sulphate and aluminium potassium sulphate (APS) would have to be purchased. The copper sulphate is not a problem, but the APS appears to be available in two forms: APS 12-WATER LR and APS 24-water LR. The APS in the chemistry set is 24-water (LR is not mentioned), but the type available from a supplier is 12-WATER LR. Would the 12-WATER LR be okay? Also, can anyone suggest a UK chemical supplier that sells small quantities of chemicals? The smallest weight I've found so far is 500g. Thanks.