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400. -. HSO. 4. 300. Some species (mmolal). 200. +. H. +. FeCl. 100. --. SO. 4. +++. ( aq ). Fe. O. 2. 0. 0. 200. 400. 600. 800. O. (aq) reacted (mmolal). 2. Pyrite. Balancing reactions. Hematite.

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  1. 400 - HSO 4 300 Some species (mmolal) 200 + H + FeCl 100 -- SO 4 +++ (aq) Fe O 2 0 0 200 400 600 800 O (aq) reacted (mmolal) 2 Pyrite Balancing reactions Hematite

  2. Start by choosing a species to appear on the left side of the reaction. Click ???→ choose Aqueous…, Mineral…, or Gas… → select a species from the list

  3. Pyrite selected Rxn will automatically add species to create a balanced reaction. Run → Go balances the reaction

  4. Move to the Results pane. Rxn writes a reaction with Pyrite on the left side, balanced by the default basis species Return to the Basis pane to recast the reaction in any form

  5. Recast the reaction by performing basis swaps. Click to swap out an entry, then choose a species to replace it Fe(OH)3(ppd) has been swapped in for Fe++ Swap O2(g) in for O2(aq) Run → Go rebalances the reaction

  6. The reaction is automatically rebalanced in terms of a ferric iron mineral and O2(g).

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