For my chemistry lab we had to heat sodium chloride and there was a colour change and a sizzling sound. Is it a decomposition or synthesis reaction, and what is the balanced chemical equation for it?


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    $\begingroup$ Doesn't sound like sodium chloride to me; salt is pretty thermally stable, although you could conceivably melt it with a blow torch (mp. is 801 degrees C). $\endgroup$ – J. LS Apr 7 '15 at 21:13

My guess would be that this was rather the dissociation of Sodium Carbonate or Sodium Hydrogen Carbonate.

The equations for the dissociation of Sodium Carbonate and Sodium Hydrogen Carbonate, respectively, are as follows:

$$\ce{Na2CO3 -> Na2O + CO2}$$


$$\ce{2 NaHCO3 -> Na2O + H2O + 2 CO2}$$

  • $\begingroup$ a rather wild guess, i think $\endgroup$ – Karl Jun 25 '18 at 18:38

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