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

Sure! The website that provides some simple rules for solubility is http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html. You can visit this website to learn more about solubility rules and determine the solubility of different compounds in water.

Regarding your second question, the least soluble ionic compound in water among the options provided is Ag3PO4. This compound is considered insoluble in water. The other compounds, BaBr2, CaCl2, and NaI, are all soluble in water.

I hope this helps, and if you have any more questions, feel free to ask!