The solubility of lithium fluoride in water increases only slightly with temperature in the range measured, going from 0.132% at 23.7°C to 0.150% at 81.8°C. The solubility product of lithium fluoride determined at 30°C in the presence of the common ions agreed within 0.2 X 10"3 of the 2.8 X 10~3 value calculated from flame photometric lithium measurements made at the same temperature on pure lithium fluoride solutions. Solubility results verify those determined gravimetrically over the range of 0-35°C by Payne in 1937.Although some water solubility data for lithium fluoride is in the literature (5), the published values in the range of general interest, i.e., 0-100°C are sparse and somewhat erratic. The most consistent set of data is that of Payne (4) which covers the range of 0-35°C. The triple purpose of this work was to verify Payne's data, to extend measurement to higher temperatures, and to determine the effect of the common ion by calculation of the solubility product.

Volumen xxx, Fasciculus Y (1947). 1303lylsaure krystallisiert von selbst und wird so in fast quantitativer Ausbeute aus dem a-Cyano-,9-methyl-glutaconsaure-diathylester erhalten.

The reaction of kaolinite with potassium hydroxide (1 to 9N) was investigated between 70 and 90°C. During a first period of the reaction the content of Si and Al in solution increased and reached a maximum in 100 to 240 minutes, depending on KOH concentration and temperature; then an amorphous aluminosilicate gel formed. After an induction period, again depending on KOH concentration and temperature, the concentrations of Si and Al decreased rapidly, due to the formation of a crystalline potassium aluminosilicate.

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