Week 1



Week 13

|Lab 1 |See Table 1 |W12_L1_galvanic cells |

|Galvanic cells | |Highest potential cell |

|Intersection |Projector, computer |IS13 |

|Review Nernst, SHE, table reduction, concept map |Ed’s demos: oxidation states of V or Mn, | |

|echem |electrolysis of water, potato clock, Zn/Cu | |

| |electrochemical cell? | |

|Section | | |

|Poster session | | |

|Lab 2 |One computer per group for report writing |W13_L2_vitamin C |

|Vitamin C | |Report |

|Assignments: | | |

Table 1: W12_L1_Galvanic Cells

|Chemical Supplies from Stockroom |Nonchemical Supplies from Stockroom |Supplies for us to provide |

|ZnSO4 |1.0 M |10 mL |24 well microplates |PASCO voltmeters (8) |

|Cu(II)SO4 |1.0 M |10 mL |5.5 cm diam. filter paper |PASCO temperature probes (8) |

|Copper (II) nitrate |0.1 M |1 L |Steel wool | |

|Copper (II) nitrate |2 M |250 mL |Wires or strips of: copper | |

|Copper (II) nitrate |0.01 M |250 mL |Wire strips of zinc | |

|Zinc nitrate |0.1 M |250 mL |Wire strips of iron | |

|Silver nitrate |2 M |250 mL |Wire strips of silver | |

|Silver nitrate |0.01 M |250 mL |Wire strips of magnesium | |

|Silver nitrate |0.1 M |1 L | | |

|Iron (III) nitrate |0.1 M |250 mL | | |

|Magnesium nitrate |0.1 M |250 mL | | |

|Potassium nitrate |0.1 M |500 mL | | |

*Quantity is the amount need for each section of the studio class assuming 24 students in each studio session.

It is preferable to have the chemicals in bottles with droppers attached.

Lab Description: Students will be making small-scale galvanic cells in the microplates using KNO3 soaked filter paper strips as the salt bridge. Students will scale up one galvanic cell in the 50mL beakers to look at the effects of temperature on the EMF of the cell.

Lab 2

Source of studio: Sowa, S., & A.E. Kondo. (2003). “Sailing on the ‘C’: A Vitamin Titration with a Twist.” Journal of Chemical Education, 80(5), 550-551.

Students determine amount of Vitamin C in various fruits in order to determine the fruit that best supplies Vit C per volume.

|Chemicals | |Supplies Needed |Supplies we have |

|2% starch solution |300 mL |Tape measures |Lemons, limes, oranges, grape fruit |

| | | |(2-4 each |

|Vitamin C tablets (100-500 mg) |25 | |Knife for cutting fruit |

|Iodine solution |1 L | |Juicer if available |

|1% I2 /2% KI; 10 g I2 + 20 g KI per liter (1000 | | | |

|mL). | | | |

|Please label as ~1% | | | |

|acetic acid |0.2 M 600 mL | | |

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