Abstract
From the analysis of the precipitates and their mother licuids, it was found that the minimum concentrations of K+ at various temperature were conciderably high to precipitate the Engel salt from the solutions of various mixing rate of MgCO3·3H2O and KHCO3. They were 0.7. 0.8 and 1.05g/100ml at the temperature of 0°, 5° and 15° respectively.
As to the effect of the other salts to the precipitation of Engel Salt, it was cleared that NaCl did not decrease the precipitation rate but retarded undoutedly the velocity of precipitation, although MgCl2 and MgSO4 decreased considerably both rate and velocity of precipitation. Perticularly the preventing action of MgCl2 was intense, addition of 1% decreased about 10% of precipitation rate.
