Lab 2 Chemistry of Life

TYPE YOUR FULL NAME: Julie Joyce Snead

TYPE YOUR FULL NAME: Julie Joyce Snead

UMUC Biology 102/103

Lab 2: The Chemistry of Life

INSTRUCTIONS:

* On your own and without assistance, complete this Lab 2 Answer Form electronically and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).

* To conduct your laboratory exercises, use the Laboratory Manual that is available in the WebTycho classroom (Reserved Reading or provided by your instructor) or at the eScience Labs Student Portal. Laboratory exercises on your CD may not be updated.

* Save your Lab2AnswerForm in the following format: LastName_Lab2 (e.g., Smith_Lab2).

* You should submit your document in a Word (.doc or .docx) or Rich Text Format (.rtf) for best compatibility.

Experiment 1: What Household Substances are Acidic or Basic?

Table 1: pH values of common household substances

Substance | pH Guess | pH Paper |

Vinegar | 3 | 4 |

Sodium bicarbonate solution | 6 | 7 |

 Whole Milk | 6 | 6 |

 Palmolive dish soap | 6 | 5 |

 V8 Vegetable Juice | 3 | 4 |

 Windex Glass cleaner | 7 | 8 |

Questions

1. Compare and contrast acids and bases in terms of their H+ ion and OH- ion concentrations.

Acids ionize in a solution to increase the concentration of hydronium ions (H3O+), typically. Bases typically dissociate in a solution to increase the concentration of hydroxide ions (OH‐). Acids contain higher levels of H+ ions than water and have pH values below 7. Acids are proton (H+ or H30+) donors, whereas, bases are proton acceptors.

2. Name two acids and two bases you often use.

Orange juice and vinegar are two examples of acids. Toothpaste and baking soda are two examples of bases.

Experiment 2: The Effect of Surface Area and Volume

Table 2: Results from surface area to volume experiment

Cube Dimensions | Surface Area (cm2) | Volume (cm3) | Surface Area : Volume | Time Require for Complete Color Change |...