Lesson 5 Lab: Dilutions and the Potato Cannon
PART 1
Begin by viewing the following Thinkwell video
27.1.5 CIA Demonstration: Dilutions
After you watch the above video, answer the questions below in sufficient detail:
(a) (4 pts.) What are the two most important pieces of glassware in this lab demonstration? What is special about these two pieces of glassware that would warrant them to be used in this particular lab? Why these as opposed to, say a graduated cylinder, a beaker, a graduated pipette, etc.?
Answer:
(b) Suppose you were required to make a solution by diluting 15.0 mL of an aqueous solution to a final volume of 500 mL.
(4 pts.) Describe, in as much detail as possible, the entire dilution process from beginning to end as described in this lab. How are the two solutions properly mixed together? What is the role of the meniscus in this process?
Answer:
[ii] (2 pts.) When preparing this solution, you accidentally go over the fill line. Your lab partner says not to worry about it, and advises you to just suck out a little of the solution off the top with a pipette until it is below the line. But your friend next to you from one lab group over advises against it, and suggests you just start over from the beginning, even though lab class is about over! To whom should you listen, and why? Explain.
Answer:
(c) (2 pts.) In your own words, how would you define the term “dilution”? Give a specific example and explain how you use the concept of “dilution” in your everyday life.
Answer:
PART 2
Please watch the following Thinkwell video:
5.1.6 CIA Demonstration: The Potato Cannon
After you watch the above video, answer the questions below in sufficient detail:
(a) (4 pts.) What two gas laws (names and definitions) are responsible for how/why the Potato Cannon (a.k.a. spud gun) works? How so? Explain how these laws are working here after the gun ignites to expel the potato.
Answer:
(b) (4 pts.) Suppose it is a hot summer day (32 degrees C), and you have left a can of hairspray outside so the gas within it is now at the same temperature of its surroundings. As part of your chemistry lab class, you have to build a safe and effective potato gun to share with the local elementary school, and you must be sure that the combustion chamber is well insulated and will not harm (burn) the shooter. You spray the warm hairspray into the 4.0 L chamber on your gun. You seal the cap, then ignite it, and the resulting gas expands to 17.0 L as the potato is shot out. What is the final temperature, in Celsius, inside the combustion chamber? What is this temperature in Fahrenheit? [SHOW ALL WORK TO RECEIVE CREDIT]
Answer:
DON'T FORGET TO INCLUDE REFERENCES IN ORDER TO FULLY DEVELOP YOUR ANSWERS AND GO BEYOND THE BASICS OF THE QUESTION!
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