The relative population of each of the three water environments with increasing KOH concentration is shown in Figure . The percentage (%) of the population of tetrahedrally coordinated water increases from ~59% in 0.1M KOH to ~71% in 6M KOH, while the population of trihedrally coordinated water and free water decrease gradually from ~29% to ~11% (trihedral) and to ~23% to 6% (free), respectively. Similar trends are observed in NaOH and RbOH electrolytes too. Du et. al. have recently provided evidence based on computational calculations that alkali metal cations can affect the water-water coordination. They observed that the hydration number decreases and the water-water coordination number increases with increasing concentration of alkali metal cations. This is in line with our observation that as the concentration of KOH/NaOH/RbOH increases, the % of tetrahedral water increases.