i was wondering which ones are soluble in water and what ones are not: K2CrO4, CaS, Na2S, and BaSO4

I was also wondering if AgBr and CaCO3 are soluble as well.

BaSO4, AgBr and CaCO3 are insoluble. The others are soluble. I can give you a web site that gives some simple rules for solubility.

can i have the website please and also 1 more question...What ionic compound would be least soluble in water...
1)BaBr2
2)CaCl2
3)NaI
4)Ag3PO4

Thanks so much for ur help :)

Ag3PO4 is insoluble. The others are soluble in water. Here is the web site. http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html