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thermal decomposition of sodium hydrogen carbonate

2 NaHCO3 (s)-------> Na2CO3 (s) + H2O (l) + CO2 (g)

Above the yield sign is heat because it is thermal decompostion

2 NaHCO3 (s)-------> Na2CO3 (s) + H2O (l) + CO2 (g)

limewater test for carbon dioxide

Ca(OH)2 (aq) + CO3 (g) -------> CaCO3 (s) + H2O (l)

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