The Decomposition of Baking Soda

Topics: Chemical reaction, Sodium bicarbonate, Carbon dioxide Pages: 1 (274 words) Published: April 14, 2013
The Decomposition of Baking Soda
-To determine the correct balanced equation for the decomposition of baking soda using % yield. PreLab Notes:
Sodium Bicarbonate (Baking Soda) decomposes when heated yielding both gaseous products and solid products. The production of gas makes baking soda a leavening agent in baked goods. The trapped bubbles of gas give muffins and cakes a lighter, airier texture. When heated, baking soda decomposes in one of the following unbalanced equations. NaHCO3 (s)  H2O (g) + CO2 (g) + Na2O (s)

NaHCO3 (s)  CO2 (g) + NaOH (s)
NaHCO3 (s)  H2O (g) + CO2 (g) + Na2CO3 (s)
Develop a procedure to determine which reaction occurs. Be sure to include specific quantities, times, and equipment. Make sure you have a way to assess the precision on the experiment.
The % yield of a reaction can be used to determine the efficiency of a chemical reaction by comparing the theoretical yield from a reaction with the actual yield.

% Yield = Actual yield x100
Theoretical Yield

Actual Yield = Mass of product produced through experimentation Theoretical Yield = Mass of product predicted to be produced using stoichiometry

A theoretical yield close to 100% is very good. Above 100% means that your product is more massive than it should be. Maybe there is something else there? Below 100% might mean that you are not producing enough product. Some of it is being wasted or is escaping. Please note that it is rare for an experiment to provide a % yield of EXACTLY 100%.

In this experiment, the reaction with the % yield closest to 100% should be the correct chemical equation. You may also use this % yield to assess the accuracy of this experiment.
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