2/3 of water is intracellular -> most potassium ions

1/3 of water is (1) interstitial (between the cells) fluid and (2) blood plasm) -> most sodium and chloride ions

I'm going to encourage you a little, to help you get started. :)

I am going to encourage you a little, to help you get started :)
Since you looked us up and read the site enthousiastically, I would like to offer you a big discount.