Find the % content of K2CO3, Na2CO3, SiO2 in a substance consisting of these compounds. From 0.1250 g of this substance, after treatment with hydrochloric acid and evaporation of the filtrate from SiO2, 0.1282 g of a mixture of KCl and NaCI was obtained; in this mixture was determined by Cl-titration with 0.1003 N AgNO3 solution, which required 19.70 ml.

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