Baking Soda Lab

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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

Stoichiometry

Key

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

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.
Calculations
• Find the theoretical mass of NaCl that would be produced if
• 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.

NaHCO3 + HCl NaCl + H2O + CO2

Baking Soda Lab

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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

Data Table

90.25 g

3.67 g

NaHCO3

93.92 g

92.68 g

Calculations
• Find the theoretical mass of NaCl that would be produced if
• 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