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PART 1
Purpose (put into lab book)
The purpose of this lab is to determine how increasing the amount of water affects the time it takes for the reaction to occur.
Hypothesis (answer in a complete sentence in lab book)
How do you think increasing the amount of water will affect the time it takes for the reaction to occur?
Materials (read the procedure below and list at least 3 different chemicals and 3 different materials you will need)
Procedure (read - DO NOT write in lab book)
For trial 1, measure out 10 mL of solution A in the graduated cylinder labeled A.
Measure out 10 mL of solution B in the graduated cylinder labeled B.
Pour A into the 50 mL beaker.
Have your stopwatch ready. Add solution B into solution A and hit start as soon as they make contact.
Hit stop when the reaction ends. It will be obvious when the reaction is done taking place. If you don't hit stop at the right time or miss the end of the reaction, redo the trial. Record the time in seconds.
Discard the contents of the beaker down the drain and rinse out the beaker.
In the remaining trials, solution A will remain at 10 mL, but solution B will be decreased and water will be added in its place. For trial 2, measure out 10 mL of solution A in the graduated cylinder labeled A. Measure out 9 mL of solution B in the graduated cylinder labeled B. Fill it the rest of the way up to the 10 mL mark with water (1 mL). Repeat steps 3-6 above for this trial.
Repeat for other trials decreasing solution B and increasing water as shown in the data table below.
Data (put into lab book)
If you are absent click here to collect the data for your data table below.
Graph (set up the x and y axes in your lab book)
Title: Time vs Amount of Water in a Reaction
Graph your data using LoggerPro or if you are graphing from home, graph it by hand
Do not curve fit or get an equation for your graph. Instead, select the "Connect Points" feature on the graph (double click on graph to find that option).
** Remember: the variable you were testing goes on the y axis, the variable you were changing goes on the x axis.
Purpose (put into lab book)
The purpose of this lab is to determine how increasing the temperature affects the time it takes for the reaction to occur.
Hypothesis (answer in a complete sentence in lab book)
How do you think increasing the temperature will affect the time it takes for the reaction to occur?
Materials (read the procedure below and list at least 2 different chemicals and 4 different materials you will need)
Procedure (read - DO NOT write in lab book)
For trial 1, measure out 10 mL of solution A in the graduated cylinder labeled A and 10mL of solution B in the graduated cylinder labeled B.
Pour solution A into one of the 50 mL beakers and pour solution B into the other 50 mL beaker.
Create a cold water bath. To do this, take the plastic container and fill it with ice. Then fill it about halfway with cold tap water.
Take the 2 beakers with solution A and solution B and place them each carefully in the cold water bath. Put a thermometer in each solution to monitor it's temperature. (Be careful! The beakers tend to want to tip over and spill their contents. If this happens you will need to start over.)
Now monitor the temperature of each solution until they cool down to a temperature of 5oC. You may need to move the beakers around in the cold water bath occasionally.
Have your stopwatch ready. As soon as the solutions reach 5oC, remove them from the cold water bath and add one solution into the other and hit start as soon as they make contact.
Hit stop when the reaction ends. Record the time in seconds.
Discard the contents of the beaker down the drain and rinse out the beakers.
Repeat for other trials at the following temperatures: 15oC, room temperature, and 45oC. Note: For room temperature, measure the temperature of the solutions as they are in the room and record that temperature in your data table. For 45oC, you will need to empty your plastic container and create a warm water bath with hot water from the cooler in the room.
Data (create a data table in your lab notebook that you will use to collect your data for Part 2)
If you are absent click here to collect the data for your data table below.
Graph (set up the x and y axes in your lab book)
Title: Time vs Temperature of a Reaction
Graph your data using LoggerPro or if you are graphing from home, graph it by hand
Do not curve fit or get an equation for your graph. Instead, select the "Connect Points" feature on the graph (double click on graph to find that option).
** Remember: the variable you were testing goes on the y axis, the variable you were changing goes on the x axis.
Conclusion (put into lab book - You do not have a 3 paragraph conclusion)
Answer the following questions about Part 1:
1. What is the relationship between the amount of water and the time it takes for the reaction to occur?
2. What does adding water do to the concentration of solution B?
3. How does concentration affect the time it takes for a reaction to occur?
4. Sketch what you think a graph would look like if you were to graph time (y) vs concentration (x) instead of time (y) vs amount of water (x).
Answer the following questions about Part 2:
5. What is the relationship between the temperature and the time it takes for the reaction to occur?
6. Based on both parts, what are the best conditions of concentration and temperature to speed up a reaction?
Classify the following errors as either human error, experimental error, or no effect on the experiment:
7. Your lab partner does not accurately measure out the ten milliliters of solution A.
8. One group decided to stop the timer when the color first started for every trial and another group decided to stop the timer when the color fully changed for every trial.
9. Due to the nature of the reaction it is hard to determine when the color first starts making it difficult for you to decide when to hit stop on the stop watch.
10. In part 1, the temperature in the room dropped dramatically from trial 1 to trial 6.
PART 2
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