Lab 7
Date:
Decomposition of Sodium Bicarbonate
Objective Decompose NaHCO3 and compare moles of reactant to product.
NaHCO3

Na2CO3
+
CO2
+
H2O
Experiment (M1) Mass of empty evap. dish _______ g
(M2) Mass of dish with 2-4 scoops of NaHCO3 = ____ g
Heat evap. dish. Stir carefully chemical scoop.
Heat for 6-8 minutes.
(M3) Mass of evap. dish with Na2CO3 = ____ g
(M1) Mass of empty evap. dish = _______ g
(M2) Mass of evap. dish with NaHCO3 = ____ g
(M3) Mass of evap. Dish with Na2CO3 (after heating) = ____ g
Analysis –
1. Calculate the mass of NaHCO3 that you began with.
2. Calculate the mass of Na2CO3 that you ended with.
3. Calculate the molar mass of NaHCO3 and Na2CO3.
4. Convert the mass of NaHCO3 into moles of NaHCO3
5. Convert the mass of Na2CO3 into moles of Na2CO3.
6. Compare the number of moles of NaHCO3 to the number of moles of Na2CO3.
7. According to the balanced reaction, for every 2 moles of NaHCO2 that
decomposed, 1 mole of Na2CO3 is produced. Does this agree with your
answer to number 6?
Results –