[Natalie.bedel]

In my lab, we have to find the mass percent of bicarbonate compound in a solid mixture of potassium bicarbonate and potassium carbonate. We have 1.5 g of the mixture and after heating to decompose the bicarbonate, we have 1.13 g.  The equation for the reaction is 2KHCO3-->K2CO3+H2O+CO2.  How do you find the mass percent of the bicarbonate in the original mixture using stoichiometry?

[Borek]

What does react during heating - and how? Can you describe changes with reaction equation(s)?