|Purpose: To examine the relationship between the concentration of a reactant and the amount of gaseous product generated.
Time Required: One 50 minute class period
Group Size: 6 students
- 5 100 mL graduated cylinders
- Baking soda
- Dish soap
- Set of measuring spoons
Prior Knowledge:Reaction rates
- You will set up a series of five graduated cylinders that contain a set of diminishing concentrations of vinegar.
- Using a syringe, measure out 10.0 mL of vinegar and put it into a 100.0 mL graduated cylinder.
- Using the syringe, draw up 8 mL of vinegar + 2 mL of water, to make a total of 10.0 mL of solution. Place in the second graduated cylinder.
- Using the syringe, draw 6 mL of vinegar + 4 mL of water, to make a total of 10.0 mL of solution. Place in the third graduated cylinder.
- Using the syringe, draw 4 mL of vinegar + 6 mL of water, to make a total of 10.0 mL of solution. Place in the third graduated cylinder.
- Using the syringe, draw 2 mL of vinegar + 8 mL of water, to make a total of 10.0 mL of solution. Place in the third graduated cylinder.
- Add one drop of dish soap to each graduated cylinder.
- Now you need to measure out 5 piles of baking powder that will be mixed with the vinegar.
- Measure out 1/2 teaspoon of baking soda onto 5 separate small pieces of paper.
- Now it’s time to mix the reagents together!!! You are looking to measure the height of the soap bubbles as they rise up the graduated cylinder column.
- Mix 1/2 teaspoon of baking soda with the 10.0 mL of vinegar in the first graduated cylinder. Record the greatest height of the bubbles.
- Repeat with each of the of the graduated cylinders, recording the greatest height of the bubbles each time.
|Baking soda||+||Vinegar||sodium acetate||+||water||+||Carbon dioxide gas|
| ||height (in mL)|
|graduated cylinder #1|
10.0 mL vinegar
|graduated cylinder #2|
8.0 mL vinegar + 2 mL H2O
|graduated cylinder #3|
6.0 mL vinegar + 4 mL H2O
|graduated cylinder #4|
4.0 mL vinegar + 6 mL H2O
|graduated cylinder #5|
2.0 mL vinegar + 8 mL H2O
- Make of graph of your experimental data . Use volume of vinegar added to baking soda as the independent variable and height as the dependent variable.
- Construct a line of best fit and calculate the slope of the line.
- Write the equation for the line