Help Limiting Reactant
Purpose
To illustrate the concept of a limiting reactant in a chemical reaction.
Materials
graduated cylinder
balance
3 250 mL Erlenmeyer flask
3 rubber balloons
4.2 g magnesium ribbon
300 ml 1.0 M HCI
Procedure
1. Add 100 mL of the hydrochloric acid to each flask.
2. Weigh out 0.6 g, 1.2 g and 2.4 g of magnesium ribbon and place each sample into its own balloon.
3. Stretch the end of each balloon over the moth of each flask. Do not allow the magnesium ribbon in the balloon to fall into the flask.
Make a prediction as to which balloon will inflate the largest.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.