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error: singular matrix

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I would like to try a simple speciation model to check the predominant Au species in an experimental system.


The experimental system is as follows;


acetate buffer (0.2 molal, 50:50 sodium acetate: acetic acid, decoupled HCO3-: acetate redox pair as pH is consistent after cooling)


Au (added as AuCl4- or native Au)


0.2 molal NaCl


I am interested in the effect of how changing the chloride concentration will affect gold speciation and solubility.


I consistently get singular matrix errors when trying to set up this system and am now getting confused as to what kind of input to use. Some help with setting up the input would be most appreciated.



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