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EC number: 231-717-9
CAS number: 7699-43-6
During the second experiment, investigating the reactivity with water, a
precipitate was observed after neutralisation of the sample and the
total dissolved zirconium concentration was demonstrated by ICP-MS to
have reduced drastically. These results were consistent with data from
literature. Hydrolysis of ZrOCl2 is recognised as being incomplete in
the presence of hydrochloric acid, with the formation of a stable
zirconium oxychloride intermediate, not the anticipated oxide.
The water solubility of zirconium dichloride oxide was determined following a pre-test of the EC A.6 test method to be very soluble (miscible at a 1 to 1 ratio) at 20 °C (O'Connor and Woolley, 2010). This study was considered as the key study.
The key study was the study of O'Connor and Woolley (2010). In this
study zirconium dichloride oxide was determined to be miscible with
water at a 1 to 1 ratio. When dissolving zirconium dichloride oxide,
hydrochloric acid is generated, acidifying the sample solution and
establishing a stable equilibrium. On neutralisation of the solution,
the hydrochloric acid is consumed, the equilibrium disrupted and
hydrolysis is able to continue towards completion. The zirconium content
of the solution is lost through precipitation, most probably as the
insoluble hydrolysis product zirconium dioxide.
The concluded high solubility from the study was supported by
peer-reviewed data from three handbooks indicating zirconium dichloride
oxide to be very soluble in water (Lewis, 1992; Lide, 2001; O'Neil,
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