DRAFT: This module has unpublished changes.

Prepare the crucible as follows:

 

 a. Place the crucible and lid on the clay triangle over the Bunsen burner.

 

b. Heat the crucible with a gentle flame for 5 minutes by moving the burner  around the bottom of the crucible.

 

c. After the bottom of the crucible has become red-hot, increase the flame by allowing more air into the burner.

 

d. Continue moving the burner around the bottom of the crucible.

 

e. Heat the crucible for 10 to 12 minutes.

 

f. Allow the crucible to cool to room temperature.

 

Table 1:  Mass of the empty crucible measured to the nearest milligram

 

Measurement

Trial 1

Crucible and lid before heating (g)

39.035 g

Crucible and lid after the first heating (g)

39.032 g

Crucible and lid after the second heating (g)

39.031 g

 

DRAFT: This module has unpublished changes.