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We develop a 2‐D pore scale model of coupled fluid flow, reactive transport, and calcium carbonate (CaCO₃) precipitation and dissolution. The model is used to simulate transient experimental results of CaCO₃ precipitation and dissolution under supersaturated conditions in a microfluidic pore network (i.e., micromodel) in order to improve understanding of coupled reactive transport systems perturbed by geological CO₂ injection. In the micromodel, precipitation is induced by transverse mixing along the centerline in pore bodies. The reactive transport model includes the impact of pH upon carbonate speciation and a CaCO₃ reaction rate constant, the effect of changing reactive surface area upon the reaction, and the impact of pore blockage from CaCO₃ precipitation on diffusion and flow. Overall, the pore scale model qualitatively captured the precipitate morphology, precipitation rate, and maximum precipitation …