A straightforward treatment of activity in aqueous CaCo3 solutions and the consequences for nucleation theory
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The aqueous calcium carbonate system is rigorously investigated with respect to ionic activity. Ideal treatment is found to be a good approximation at relevant concentrations. The data further show that bound CaCO3 species cannot be regarded as «inactive» during nucleation but rather appear to play a key role in the phase-separation process, and that amorphous calcium carbonate (ACC) can be precipitated from much lower levels of supersaturation than previously believed. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.