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Redox Fe2+ to Fe3+ and charge balance

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I have an acidic (pH 2) highly saline oxygenated solution based on seawater with a range of other metal salts added. In actual experiments we also add FeSO4. We then add H2O2 to oxidise the Fe2+ to Fe3+. In Spec8 this creates a charge imbalance as there are additional anions required to balance the additional Fe charge. There is little change in pH. In Spec8 the predominant Fe species remains as Fe2+ where it should be Fe3+ after H2O2 addition. How do I charge balance in this case and maintain Fe3+ as the predominant Fe species? Any tips appreciated. Thank you.

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