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Potassium Thorifluoride, K2ThF6.4H2O

Potassium Thorifluoride, K2ThF6.4H2O, is formed as an amorphous, insoluble powder when freshly precipitated thorium hydroxide is boiled with a concentrated solution of potassium fluoride containing hydrofluoric acid. The precipitate obtained by adding thorium chloride to potassium hydrogen fluoride solution is possibly KTh2F9.6H2O, whilst with neutral potassium fluoride the product is KThF5.H2O. When thorium fluoride and potassium fluoride are fused together and the mass is extracted with water KThF5 remains; and when acidified rubidium fluoride is added to a thorium salt solution RbThF5.3H2O is precipitated. The amorphous and insoluble natures of these compounds differentiate them from other double or complex fluorides of the fourth group.
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