2-4: Precipitation Reactions

1. Start Virtual ChemLab and select Precipitation Reactions from the list of assignments. The lab will open in the Inorganic laboratory.

2. React each of the cations (across the top) with each of the anions (down the left) according to the data table using the following procedures:

Data Table
| |AgNO3 (Ag+) |Pb(NO3)2 (Pb2+) |Ca(NO3)2 (Ca2+) |
|Na2CO3 (CO32-) |A NR |F Milk color |K Milk color |
|Na2S (S2-) |B dark grey |G Dark grey |L NR |
|NaOH (OH-) |C light grey |H NR |M Milk color |
|Na2S04 (SO42-) |D NR |I Milk Color |N NR |
|NaCl (Cl-) |E milk color |J Milk color |O NR |

a. Enter the stockroom by clicking inside the Stockroom window. Once inside the stockroom, drag a test tube from the box and place it on the metal test tube stand. You can then click on the bottle of Ag+ ion solution on the shelf to add it to the test tube. Click Done to send the test tube back to the lab. Click on the Return to Lab arrow.

b. Place the test tube containing the Ag+ solution in the metal test tube stand. Click on the Divide button on the bottom (with the large red arrow) four times to make four additional test tubes containing Ag+. With one test tube in the metal stand and four others in the blue rack, click on the Na2CO3 bottle on the reagent shelf and observe what happens in the window at the