Chemical equlilbria
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... ontains more FeSCN2+.To test-tube (c) I add some FeNO3 and the concentration of Fe3+ is increased and the solution turns darker red à the concentration of FeSCN2+ is higher. Since no more SCN- has been added the ratio Fe3+ and SCN- must be in equilibrium. The solution now contains Fe3+, SCN-, FeSCN2+, N ...
