Abstract
AbstractThe growth of calcite crystals from an aqueous supersaturated solution of initial concentration 0.15 mol m−3 containing 10 mol m−3 of (NH4)2CO3 has been studied at 298 K. The progress of growth has been followed through determining the composition of the solution by chemical analysis. The crystal growth is controlled by the surface reaction mechanism and satisfies a kinetic equation of the second order with the rate constant 3.7 × 10−6 m4 mol−1 s−1 that is independent on the surface area of the present solid. NH4+ ions do not change the crystal growth mechanism but decrease the growth rate of calcite crystals.
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