Chemistry 2014
Kool-Aid Concentration Lab
Name__________________________
In this lab, you will be making 4 different concentrations of Kool Aid solution to determine the “ideal” amount of sugar in
Kool Aid. In chemistry, concentration is usually measured by the number of moles of substance dissolved in a liter of a
solution. This is called molarity and is expressed as mol/L or M (The formula is: M = moles/Liter).
Molarity = Moles
Sample problem 1:
If we had 1.00 mole of sucrose C12H22O11 (342 grams) and dissolved it to make 1 liter
of sugar water. What would be the molarity of this solution?
Liters
Molarity = 1.00Moles = 1.00 mol/L = 1.00 M
1.0 Liters
Answer: 1.00 mol/L = 1.00 M
Sample problem 2:
What is the molarity if you dissolve 256.73 grams of sucrose C12H22O11 in 2.50 L of solution? First, find out the
number of moles.
256.73 g sucrose X 1 mole = 0.75 moles
342.3 g
Molarity = 0.75 Moles = 0.300 mol/L = 0.300 M
2.50 Liters
Answer: 0.300 mol/L = 0.300 M.
Sample problem 3:
How many grams of sucrose C12H22O11 would you dissolve in 0.1 L of water to make a 2 M sucrose solution?
First, figure out how many moles you will need. Then convert from moles to grams.
Molarity = Moles
Liters
2 M = Moles
0.1 L
Solve for moles
2 M X 0.1 L = 0 .2 Moles
Convert from moles to grams
0 .2 Moles C12H22O11 X 342 grams = 68.4 grams
1 mole
Answer: Dissolve 68.4 grams of C12H22O11 in 0.1 Liters to make a 2 M solution.
O’Ryan
Chemistry 2014
Pre-lab questions.
1. What is the molar mass of sucrose? C12H22O11 ________________________________________________________________
2. If you have 171.15 grams of sucrose, how many sucrose moles do you have? How many molecules do
you have? _______________
[Show your work]
[Show your work]
3. What solvent is used to make Kool Aid? ____________________________________________________
4. List 2 solutes in Kool Aid. ________________________________________________________________
5. In this lab, you will be making 100 mL solutions of varying concentrations. How many grams of sucrose
C12H22O11 will you need to make the following solutions?
Molarity
1.0 M
0.75 M
0.50 M
0.25 M
Grams in 1 Liter solution
Grams in 0.1 L solution (100 mL)
Purpose: To see which molarity of sugar makes the best Kool Aid.
Procedure:
Materials: Kool-Aid Powder, Sugar, Straws (to stir solutions), Water, Balance, cups
1. __________________________________________________________________________________________________
2. __________________________________________________________________________________________________
3. __________________________________________________________________________________________________
4. __________________________________________________________________________________________________
Data:
Molarity
Grams of C12H22O11
Observations (Taste Test)
Calculations/ Analysis:
1. What was the solute used in this lab? ____________________What was the solvent? _______________________
2. Which concentration was closest to the ideal concentration of Kool-Aid? ________What was wrong with each of the
other solutions that you made? _________________________________________________________________________
3. There are 4 calories per gram of sugar. How many calories are in a 200 mL sample of your Kool-Aid? ______________
* Extra Credit – Check the website for the extra credit associated with this lab. This would be a great Digital
…Arts Infusion project. This extra credit project will be due January 8th, 2015.
O’Ryan