Exercise 50. Sodium Perborate

Dissolve 20 g. of borax and 4 g. of sodium hydroxide in the minimum volume of cold water and slowly add the solution to 120 cc. of a 3 per cent solution of hydrogen peroxide (the usual concentration of the reagent). Cool the solution in ice water. After a short time, small difficultly soluble crystals of sodium perborate separate. Filter the crystals and wash them with cold water, then with alcohol and ether. Dry the crystals in the air. The salt is moderately stable when well stoppered but slowly decomposes. 

Additional Exercise Ammonium perborate, Melikoff and Pissarjewsky, loc. cit. 

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