How does aragonite turn into calcite?
How does aragonite turn into calcite? Calcium carbonate can take the form of two different minerals: Calcite is the stable form, whereas aragonite is metastable: Over time, or when heated, it can ultimately transform into calcite. If there is no magnesium in the solution, the stable calcite forms quickly, Sun says. Is calcite to aragonite spontaneous? (a) AGR(298.15 K) = AG; (calcite, s) – AG; (aragonite, s) = 1128.8 kJ mol-? - 1127.7 kJ mol-1 = 1.1 kJ mo1). Because AGR(298.15 K) > 0, the reaction is not spontaneous. The pressure dependence of G is quite different for gases and...