aqueous solution
... that the second hydration shell of chromium(III) in aqueous solution contains around 13 water molecules?
... that the second hydration shell of <a href="./Chromium" id="mwZA" rel="mw:WikiLink" title="Chromium">chromium</a>(III) in <b id="mwZQ"><a href="./Metal_ions_in_aqueous_solution" id="mwZg" rel="mw:WikiLink" title="Metal ions in aqueous solution">aqueous solution</a></b> contains around 13 water molecules?