FIELD: inorganic chemistry. SUBSTANCE: synthesis is carried out using 20-35 wt.-% hydrogen peroxide and 30-60 wt.-% potassium hydroxide solution, and boric raw is dissolved preliminary in water. Mole ratios of boron to hydrogen peroxide and boron to potassium hydroxide are 1:1.2-1.5 and 1: 0.25-1.0, respectively. Prepared potassium peroxoborate has up to 25 wt.-% active oxygen and its solubility is up to 35 g/l. EFFECT: simplified method, increased solubility of the end product. 1 tbl
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