Integrated Science 2013
Kool‐Aid Concentration Lab Name____________ Introduction: In this lab, you will be making 4 different concentrations of Kool Aid solution to determine the “ideal” amount of sugar in Kool Aid. There are many ways to calculate the concentration of a substance including: molarity (M), parts per million (ppm), percent composition (% comp), and grams per liter (g/L). In chemistry, concentration is usually measured by the number of moles of substance dissolved in a liter of liquid. This is called molarity and is expressed as mol/L or M (The formula is: M = moles/Liter). Pre‐lab questions. 1. What is the molar mass of sucrose? C12H22O11 ______________________________________ 2. What solvent is used to make Kool Aid? _________________________________ 3. List 2 solutes in Kool Aid. ____________________________________________ 4. In this lab, we are going to make 100 mL samples instead of 1,000 L. A one molar solution has one mole of C12H22O11 in one liter. Since 100 mL is 1/10th of a mole, you will be using 1/10th of a mole of C12H22O11 in 100 mL to make a one molar solution.  What is the mass of 1/10th of a mole of C12H22O11? _________________________  How many grams will you need to make a 0.5 mole solution? _________________  How many grams to make a 0.75 mole solution? ________________________  How many grams to make a 0.25 mole solution? ________________________ 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 Hypothesis: [Which molarity do you predict will be best? Write as IF –THEN STATEMENT) _____________________________________________________________________ 1. ___________________________________________________________________________ 2. ___________________________________________________________________________ 3. ___________________________________________________________________________ 4. ___________________________________________________________________________ Data: Molarity Observations (Taste Test) Grams of C12H22O11 Calculations/ Analysis: 1. Which concentration that you tested was closest to the ideal concentration of Kool‐Aid? What was wrong with each of the other solutions that you made? 2. What was the solute used in this lab? What was the solvent? 3. What is molarity? O’Ryan