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Potassium sodium carbonate, K2CO3,Na2CO3,12H2O, or (K, Na)2CO3,12H2O

A Potassium sodium carbonate, K2CO3,Na2CO3,12H2O, is a constituent of vegetable ashes. At 35° C. it decomposes in accordance with the equation

3(K2CO3,Na2CO3,12H2O) = 2K2CO3 + K2CO3,3Na2CO3,10H2O + 26H2O.

The double carbonate thus generated decomposes at a temperature of about 130° C.

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