Baking Soda Stoichiometry Lab

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Baking Soda Stoichiometry Lab Powered By Docstoc
					                                         Baking Soda Stoichiometry Lab

Baking Soda, or sodium bicarbonate, is in an ingredient in many recipes for baked goods (cookies, cake, banana
bread, etc). Its purpose is to make the batter rise. When heated, sodium bicarbonate decomposes. You will use
a word equation to write a balanced chemical equation that you will use in lab for this reaction. When heat is
used to make a reaction “go”, the symbol, ∆, is used over the arrow to indicate that the reactant(s) are heated.
Since you will be heating the sodium bicarbonate, please use this symbol in your reaction.

Lab Instructions

1. Find the mass of the empty crucible. Record in data section.

2. Use the balance to measure about 3.00g of sodium bicarbonate on weighing paper. Zero out the balance with
the weighing paper on it before you find the mass of your substance.

3. Place the sodium bicarbonate in the crucible. Find the mass of the crucible and the sodium bicarbonate.
Record in the data section.

4. Place the crucible on the clay triangle.

5. Heat the crucible slowly over the Bunsen burner for 2 minutes and then with a stronger flame for 9-10
minutes. While you are heating, work on your theoretical yield calculation.

6. Turn off the flame and allow the crucible to cool before finding the mass of the crucible and remaining
product. Record in data section.
1. Mass of crucible= _________________
2. Mass of crucible and sodium bicarbonate= _______________
3. Mass of crucible and remaining product=________________
   *What substance is left in the crucible after heating? ___________________ (See balanced equation.)

Calculations: Show all work. If you use a formula, write the formula first.

1. Calculate the theoretical yield of sodium carbonate using stoichiometry and your balanced equation.
2. Calculate the percent yield of sodium carbonate.

3. Calculate the percent error.

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