I want a certain Ion in my solution. How do I choose which chemical to buy?

thanks for taking the time. I am physicist doing experiments in which I need certain Ions (at the moment, Ru(II)) in solution. I have no chemical training excepting what I'm learning right now. What I need is a research strategy on how to find which salts or compounds containing Ru(II) will dissolve in water in such a way, that the Ru ions are available to the biological system that I'm studying. Do you have any resources that you could point my way or any good starting points? Thank you again


