Question

In class, we did a decomposition reaction of sodium hydrogen carbonate, which makes water, carbon dioxide, and sodium carbonate. How do you know when sodium hydrogen carbonate is completely reacted?
You weigh the NaHCO3 to start, let it heat at the specified T, place in a desiccator to cool, weigh. Repeat heat and cooling. Weigh again. If the two weights after heating are the same, all of the NaHCO3 has been converted to Na2CO3.
Note: One must be careful with this because Na2CO3 can be decomposed to Na2O and CO2 and the loss of CO2 will show up as a loss in weight; the optimum T for NaHCO3 to Na2CO3 is about 275 C to 300 C. The decomposition of Na2CO3 is higher than that.

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