Sodium Bicarbonate and Hydrochloric Acid Stoichiometry Lab NaHCO 3 + HCl  Core II Preview

Lab Safety Today we are working with NaHCO 3 (sodium bicarbonate, also known as baking soda) and 6.0 M HCl. – The baking soda’s relatively harmless, but the acid isn’t. Wear safety glasses all day, and please clean up any spills IMMEDIATELY. – The “6.0 M” is a measure of concentration. You’ll learn more about that later. Use thermo-gloves (not tongs) for moving stuff.

Lab Safety During parts of this experiment you will be gently heating a beaker filled with reactant. Be certain that the “spout” of the beaker is pointing toward the wall/windows (away from people’s eyes and stuff).

Lab Notes Find a blank sheet of paper, a calculator, and a periodic table. You’ll need all of these for the lab. The following slides will have bits of information that, in addition to your regular class notes, are necessary for successful completion of the lab. Please take care to write them down.

Lab Notes Our reaction is going to be: – NaHCO 3 (s) + HCl (aq)  First, what type of reaction is this? – It’s a double replacement. So, we end up with this skeleton equation: – NaHCO 3 (s) + HCl (aq)  NaCl (s) + H 2 CO 3 (aq) The H 2 CO 3 quickly decomposes: – H 2 CO 3 (aq)  CO 2 (g) + H 2 O (l) Thus making the full skeleton equation: – NaHCO 3 (s) + HCl (aq)  NaCl (s) + CO 2 (g) + H 2 O (l)

Finally… The Big Idea of the lab: – You will react baking soda and hydrochloric acid, which will make three products: NaCl (sodium chloride/table salt) H 2 O (water) CO 2 (carbon dioxide) – We want to measure only one of the products, so we’re going to boil off the water and let the CO 2 leak out, ideally leaving some amount of pure NaCl behind. – Using stoichiometric calculations, you’ll also figure out what you should have formed and compare using percent yield.

So remember… Just keep in mind – this is a stoichiometry problem except you’re finding the numbers. You’ll need a balanced equation, starting moles, and a mole ratio to make some predictions about the end. – Don’t lose sight of that!