Figure 1
The binary phase diagram of sulfuric acid and water (after Beyer et al., 2003). This shows the region of solid sulfuric acid hydrates (red) and the regions where liquid sulfuric acid and solid water ice coexist (blue). The labelled vertical lines indicate the stoichiometric compositions for the observed hydrates in this system; sulfuric acid monohydrate (SAM) 84.5 wt%, sulfuric acid dihydrate (SAD) 73.1 wt%, sulfuric acid trihydrate (SATri) 64.5 wt%, sulfuric acid tetrahydrate (SAT) 57.6 wt%, sulfuric acid hemitriskaidecahydrate (SAH) 45.6 wt% and sulfuric acid octahydrate (SAO) 40.5 wt%. |