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Baking Soda Lab

Baking Soda Lab. Stoichiometry. Key. Purposes: 1. Calculate theoretical mass of NaCl based on a known mass of NaHCO 3 . 2. Experimentally determine the actual mass of NaCl produced. 3. Calculate the percent yield for your experiment.

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Baking Soda Lab

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  1. Baking Soda Lab Stoichiometry Key

  2. Purposes: 1. Calculate theoretical mass of NaCl based on a known mass of NaHCO3. 2. Experimentally determine the actual mass of NaCl produced. 3. Calculate the percent yield for your experiment. Reaction Equation: NaHCO3(s) + HCl(aq) NaCl(s) + CO2(g) + H2O(l) Materials: safety glasses baking soda (NaHCO3) concentrated HCl and dropper evaporating dish ring stand with ring bunsen burner and matches watch glass wire gauze tongs

  3. Procedure • 1. Find the mass of the evaporating dish and watch glass. • Record this mass in the Data Table. • Add 1/3 of a teaspoon of baking soda to the evaporating dish, • and record the total mass in the Data Table. • Cover the evaporating dish with the watch glass so that only the spout • of the evaporating dish is exposed. • Use the dropper to drip HCl down the spout and into the dish. • Add HCl until the fizzing ceases. • Leaving the watch glass in place, boil off the liquid until only table salt (NaCl) • remains in the dish. • Let the dish cool for five minutes, then weigh it again and record the mass • in the Data Table. • 7. Clean up by rinsing your equipment with water and wiping dry with a paper towel.

  4. Data Table

  5. Calculations • Find the theoretical mass of NaCl that would be produced if • your experiment were perfect. • Find the actual mass of NaCl that you obtained. • Find the percent yield for your experiment. If your percent yield • is greater than 100%, provide at least one possible source of error • that might have caused you to get more than 100% yield.

  6. NaHCO3 + HCl NaCl + H2O + CO2 Baking Soda Lab Print Copy ofLab Na NaHCO3 HCl + HCO3 + H Cl H2CO3 H2CO3 sodium bicarbonate hydrochloric acid sodium chloride baking soda table salt H2O + CO2 (l) (g) (g) D heat actual yield ? g gas gas D excess x g 5 g theoretical yield actual yield % yield = x 100 % theoretical yield

  7. Data Table 90.25 g 3.67 g NaHCO3 93.92 g 92.68 g

  8. Calculations • Find the theoretical mass of NaCl that would be produced if • your experiment were perfect. • Find the actual mass of NaCl that you obtained. • 3. Find the percent yield for your experiment. If your percent yield • is greater than 100%, provide at least one possible source of error • that might have caused you to get more than 100% yield. 1 mol NaHCO3 1 mol NaCl 58.5 g NaCl x g NaCl = 3.67 g NaHCO3 = 2.56 g NaCl 84 g NaHCO3 1 mol NaHCO3 1 mol NaCl 92.68 g - 90.25 g = 2.43 g NaCl (actual yield) 2.43 g NaCl actual yield 95% yield % yield = x 100 % x 100 % = 2.56 g NaCl theoretical yield

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