Name

Period

Date

Silver Nitrate Day Two Lab

OBJECTIVE

• Use stoichiometry to predict the mass of a reactant.

INFO

• Cu + 2AgNO₃ --> 2Ag + Cu(NO₃)₂
• Cu = 63.546 g/mol
• Ag = 107.868 g/mol
• N = 14.007 g/mol
• O = 15.999 g/mol

MATERIALS

• 250-mL Beaker B, stirring rod
• acetone

PRE-LAB CALCULATIONS

1. molar mass of AgNO₃ = g/mol

DATA

5. mass of Beaker B = g
6. mass of Cu wire after reaction = g

PROCEDURE

1. Wash, completely dry, label, and mass out Beaker B.
2. Gently shake the Ag crystals from the Cu wire.
3. Dip Cu wire into acetone, dry, and mass out.

*** BACK TO DESKS ***

4. Decant Cu(NO₃)₂ from Beaker A into Beaker B.
5. Place Beaker A with Ag crystals in fume hood.
6. Place Beaker B with Cu(NO₃)₂ solution in fume hood.
7. Enter data into computers.

CALCULATIONS (on back of lab paper, numbered)

1. actual mass of reacted Cu (WYG) = g
2. theoretical mass of reacted Cu (WYSHG) = g
3. percent discrepancy of reacted Cu = g

CONCLUSION

• Did a chemical reaction occur? Support your conclusion with new evidence.