Add time:08/07/2019         Source:sciencedirect.com

The crystal growth and dissolution of strontium oxalate monohydrate have been studied at 25°C by following the changes in electrical conductivity of supersaturated and subsaturated aqueous solutions seeded with aged crystals of the monohydrate salt. Both processes follow a kinetic equation in which the rate of reaction is proportional to the concentration of the lattice ions. The critical supersaturation or threshold level for homogeneous nucleation and growth of strontium oxalate is considerably lower than that for many other sparingly soluble salts. Sodium pyrophosphate shows a strong inhibiting effect on the rate of crystal growth whereas its influence on the dissolution process is negligible. The thermodynamic association constant for the formation of strontium monooxalate complexes in solution has been determined conductimetrically; the value is 510 l mole−1.

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