Lab Report

The purpose should be several sentences stating the reasons for doing this experiment. It should include both concepts and laboratory techniques. The procedure section should cite the lab manual and note any changes that were made to the procedure in the lab manual while performing the experiment.

The data section should include your own personal data, as well as the table below filled in with class data. For your personal data include all observations, the masses and a "+" or " –" indicating the results of the test. Your personal data should be in a data table similar to that of the class data.

Class Data Table

	Vol. Cu(NO₃)₂ (0.50M)	Vol. KI (0.50M)	Masses of ppt. in test tubes	Cu(NO₃)₂ Test	KI Test
A	1.0 mL 1.0 mL 1.0 mL 1.0 mL	6.0 mL 6.0 mL 6.0 mL 6.0 mL
B	2.0 mL 2.0 mL 2.0 mL 2.0 mL	5.0 mL 5.0 mL 5.0 mL 5.0 mL
C	3.0 mL 3.0 mL 3.0 mL 3.0 mL	4.0 mL 4.0 mL 4.0 mL 4.0 mL
D	4.0 mL 4.0 mL 4.0 mL 4.0 mL	3.0 mL 3.0 mL 3.0 mL 3.0 mL
E	5.0 mL 5.0 mL 5.0 mL 5.0 mL	2.0 mL 2.0 mL 2.0 mL 2.0 mL
F	6.0 mL 6.0 mL 6.0 mL 6.0 mL	1.0 mL 1.0 mL 1.0 mL 1.0 mL

Another table should be made for each of the six groups (A-F). The balanced chemical equation should be displayed above the data table. The following should be calculated for each group and placed in the data table a) average moles of product (CuI), b) moles of Cu(NO₃)₂, c) moles of KI, d) theoretical moles of product based Cu(NO₃)₂, e) theoretical moles of product based on KI, f) which reactant is the limiting reagent and g) percent error of moles of CuI.

The calculations that need to be done to fill in the data table are stoichiometry based. The first calculation needed to be done is the determination of the number of moles of each reactant; this can be done using the following equation:

Amount of Substance (moles) = Volume of Solution (L) x Concentration of Solution (M or mol/L)

Next determine the moles of product formed by using the mass of product and the molecular weight of the product. Once you determine the number of moles for each trial within a given group, calculate the average and place that value in your data table.

Next you must determine, theoretically, the moles of product and the limiting reagent. The background section for this experiment has an example and this is similar to what was done in the pre-lab assignment. In general remember the following when doing conversions for limiting reagent problems:

(where A is a reactant and B is the product, the arrow stands for "convert")

To determine the limiting reagent use the process above for each reactant. The reactant that produces the smallest number of grams of product is the limiting reagent.

Percent error can be determined using the following formula:

The calculation section should have sample calculations for the following: a) moles of Cu(NO₃)₂, b) moles of KI, c) moles of product (CuI),d) average number of moles observed, e) theoretical moles of product based Cu(NO₃)₂, f) theoretical moles of product based on KI, g) determination of the limiting reagent and h) percent error of moles of CuI.

Also include a graph of the number of moles of CuI expected (based on the limiting reagent) vs. the number of moles of KI added. All graphing guidelines apply here.

The conclusion should be in paragraph format and include the information found by doing the experiment. This section should include the findings for each set of solutions. For solutions A-F include the test results, experimental product yield, theoretical yield, the limiting reagent and the percent error. Be sure to discuss the variation in the different solutions and what causes the differences. Also discuss what information is found form the graph. Finally discuss all sources error and how they might have affected the results.