The gravimetric determination of sodium in the form of triple acetate

Attention is drawn to the possibility of the quantitative determination of sodium gravimetrically as the triple acetate with Mg(Zn) and uranyl. A historical survey of the development of these methods is given. In view of the peculiar behaviour of the water of crystallization in the triple acetates a possible analytical error of 0.25% is pointed out, whereas the latter is restricted to 0.1% by Kahane's method (reagent with 45% by vol of alcohol). Improved directions for Kahane's method are given, in which two procedures are indicated, one in the presence of little and the other in the presence of more potassium. The analytical errors, which can be applied as corrections, are indicated for both procedures.