Research Chemistry Stoichiometry Lab Assessment

Research Chemistry Stoichiometry Lab Assessment
A Scientist is trying to isolate silver from a sample of silver nitrate using copper. Use the information described
below to answer the questions about their experiment. Be sure to show all work, units, and round for sig figs.
The reaction below shows how lead can react with a solution of silver nitrate in order to displace the silver and
form a solution of lead (II) nitrate.
Pb (s) + 2 AgNO3 (aq) → 2 Ag (s) + Pb(NO3)2 (aq)
The scientist has 15.00 grams of lead metal and 20.0 grams of silver nitrate. They started by dissolving the
silver nitrate in water.
1. Based on the amount of lead they are starting with, how much silver could they isolate? (4 pts)
2. Based on the amount of silver nitrate they are starting with, how much silver could they isolate? (4 pts)
3. What is the theoretical yield of silver? Why? (2 pts)
4. Which reactant will remain in excess after the reaction is complete? Why? (2 pts)
5. How much excess reactant would be left over in the beaker after the reaction? (5 pts)
The scientist added the lead metal to the beaker of silver nitrate solution and observed a color change. After the
reaction appeared finished, they filtered out the product and allowed it to dry overnight. The next day they
determined that they had isolated 11.50 g of product.
6. What was their percent yield? (3 pts)

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