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Chemistry Lab Report Template - Lab Session Experiment: Preparation Of Sodium Chloride Page 2

3A Experiment

Chemicals needed: sodium bicarbonate, concentrated hydrochloric acid.

1. Accurately weigh an empty, dry evaporating dish, and record its mass in blanks (b) and (e) in

the table below.

2. Add to the dish about 5 g of NaHCO

and weigh again. Record the mass in blank (a) in the

table below.

3. Add 5 to 6 mL of distilled water to the dish to wet the bicarbonate. Cover the dish with a

watch glass.

4. Move the watch glass aside slightly and add, in small portions, about 6 mL of concentrated

hydrochloric acid from a 10 mL graduated cylinder. These small portions of acid should be

added so that the acid runs down the inside wall of the evaporating dish. After the addition

of 6 mL of acid, continue adding acid only as long as CO

continues to be evolved.

2 (gas)

5. Remove the watch glass and evaporate to dryness over a water bath (the evaporating dish is

placed on top of a beaker containing boiling water).

6. Next, heat the dish on wire gauze with the burner for about 3 minutes. Allow the dish to cool

and weigh accurately. Again, heat the dish, cool, and weigh. Continue heating and weighing

until the dish reaches constant mass. Record this constant mass in blank (d) in the table

below.

(a) Mass of dish and NaHCO

(b) Mass of empty dish

[(a)–(b)]

(d) Mass of dish and residue

(e) Mass of empty dish (b)

(f) Mass of NaCl residue [(d)–(e)]

7. In the reaction studied, what reactant was present in limiting quantity?

3B Calculations

1. Calculate the theoretical yield of NaCl.

58.44 g NaCl

_________ g NaHCO

___________________g NaCl

84.01 g NaHCO

2. Calculate the percentage yield of NaCl.

Actual yield × 100

(

)

× 100

___________________%

Theoretical yield

(

)

Chemistry Lab Report Template - Lab Session Experiment: Preparation Of Sodium Chloride Page 2