K2CO3 --- X --- CaCO3

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вопрос

K2CO3 is potassium carbonate, X is an unknown compound, and CaCO3 is calcium carbonate.

The reaction between K2CO3 and CaCO3 is a double displacement reaction that would likely result in the formation of two new compounds.

One possible reaction for this double displacement could be:
K2CO3 + CaCO3 -> 2KCaCO3

In this reaction, potassium carbonate reacts with calcium carbonate to form potassium calcium carbonate.

However, without more information or specific conditions, it is difficult to predict the exact products of the reaction between K2CO3 and CaCO3.