How do you determine if a compound(ionic/covalent) is soluble in water by just looking at its formula?

Question

Please help. Our teacher didn't explain things well. Thank you so much in advance.

Answer 1

There are some general rules about which inorganic salts are water-soluble, but there are many exceptions

See: http://www.ausetute.com.au/solrules.html...

Your teacher may have been talking about specific compounds which are always soluble such as ammonium salts and hydrated salts (they already have bound water in their crystal structure)