emarcuci Posted June 21, 2011 Share Posted June 21, 2011 Hi, I was recently using React to speciate a fluid from an experimental analysis. Basically, I ran an experiment at elevated temperature, but pH and cation/anion fluid analysis were measured at room temperature. I use React to rebalance the fluid at the higher temperature; however, several of my experiments have negative pH (~-0.15). React did not seem to like that. When I tried to run the model, it would say that H+ activity was negative and not give any output. I am working with 1 M H2SO4, so the pH should be that low. Can React (and the other modules) not handle negative pH? thank you, Emma Quote Link to comment Share on other sites More sharing options...
Tom Meuzelaar Posted June 22, 2011 Share Posted June 22, 2011 Hi Emma: React can work with waters that have negative pH (see attached script), but I don't think it will take a negative pH as input. Instead, use the equivalent proton activity to constrain your model. I hope that helps. Tom Meuzelaar RockWare, Inc. Quote Link to comment Share on other sites More sharing options...
emarcuci Posted June 22, 2011 Author Share Posted June 22, 2011 Morning, Thanks Tom! Entering as a concentration/activity solved the problem. Emma Quote Link to comment Share on other sites More sharing options...
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