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The  precursors  used  in  preparing  supported  gold  catalysts  are  salts  or  complexes  where  gold  is  usually  in  the  +3  oxidation  state;  a  few  of  them are in the  +1  oxidation  state,  which  is more unstable.  The  Au3+  precursor most often used is chloroauric acid (HAuCl4 3H2O), which is a commercially available orange solid; in aqueous solution  it  is a strong  acid,  quite  capable of  dissolving  alumina  and  magnesia. Moreover,  the  speciation  of  the  gold ions  depends  strongly  on  the  concentration,  pH  and  temperature  of  the solution. Gold  chloride  (AuCl3)  is also occasionally  used. From p74
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