Science - chemistry question?

When it says present in an aqueous solution it just means that the formula starts with Hydrogen, as you can see there is an "H" in front of all of them. As for what happens when it is placed in an aqueous solution, I don't get it since it already has Hydrogen. ANYWAYS, I know your frustration with this cl. I already had this cl and wanted to die every time I set foot in the doorway. It SUCKS. ...I had a 75% for the final grade...