Escience Lab 6 Diffusion

As you complete the lab, answer the questions below, when completed save with your name and then attach to the Lab 6 drop box.

Experiment 1: Diffusion through a liquid

Table 1: Diffusion Through Liquids

| Corn Syrup | | Material: Lemon Concentrate | |

Time (sec) | Blue Dye | Red Dye | Blue Dye | Red Dye |

10 | 1.7 cm | 2.1 cm | 0.7 cm | 0.6 |

20 | 2.2 cm | 2.3 cm | 0.8 cm | 0.7 |

30 | 2.2 cm | 2.4 cm | 0.8 cm | 0.8 |

40 | 2.3 cm | 2.5 cm | 0.9 cm | 0.9 |

50 | 2.4 cm | 2.5 cm | 1 cm | 0.9 |

60 | 2.4 cm | 2.6 cm | 1 cm | 1 |

70 | 2.4 cm | 2.7 cm | 1.1 cm | 1 |

80 | 2.4 cm | 2.8 cm | 1.1 cm | 1 |

90 | 2.4 cm | 2.8 cm | 1.1 cm | 1 |

100 | 2.5 cm | 2.8 cm | 1.2 cm | 1.1 |

110 | 2.5 cm | 2.9 cm | 1.2 cm | 1.1 |

120 | 2.6 cm | 2.9 cm | 1.2 cm | 1.1 |

Table 2: Diffusion Rate of Dyes in Corn Syrup

Dye Name | Molecular Weight | Total Distance Traveled (mm) | Speed of Diffusion (mm/hr)* |

Blue Dye | 496 g/mol | 26 mm | 780 mm/hr |

Red Dye | 793 g/mol | 29 mm | 870 mm/hr |

Table 3: Diffusion Rate of Dyes in Lemon Concentrate

Dye Name | Molecular Weight | Total Distance Traveled (mm) | Speed of Diffusion (mm/hr)* |

Blue Dye | 496 g/mol | 12 mm | 360 mm/hr |

Red Dye | 793 g/mol | 11 mm | 330 mm/hr |

*multiply total distance traveled by 30 to get the hourly diffusion rate

Graphs (don’t forget to label the axes!): You will need to scan these, if you cannot scan them you may FAX the graphs, or at least describe the graph, the axis labels and what the line(s) look like.

Experiment 1: Questions

1. Which dye diffused the fastest in corn syrup? In your chosen material?

A) Corn Syrup – Red Dye

Lemon Concentrate – Blue Dye

2. Does the rate of diffusion correspond with the molecular weight of the dye?

A) The rate of diffusion depends on both the molecular weight of the dye and the density of the medium. If the experiment is performed and recorded correctly than technically the smaller/lighter molecules should...