Lab 9 Solutions done

Lab 9: Solutions Background This activity reviews stoichiometry and solutions by making different concentrations of a Kool-Aid solution. 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 (formula: molarity = moles/volume). Prelab Questions 1. Calculate the molar mass of Kool-Aid. Assume the solute is pure table sugar, called sucrose. Its chemical formula is C 12 H 22 O 11 . 342 g 2. What mass of Kool-Aid is needed to make a 1.0-M solution from 100 mL? (Hint: two step problem–molarity, mole conversion) 34.2 g 3. What mass of Kool-Aid is needed to make a 0.5-M solution from 100 mL? 17.1 g 4. What mass of Kool-Aid is needed to make a 0.2-M solution from 100 mL? 6.84 g Purpose Apply your knowledge to calculate grams of Kool-Aid powder required to make three different solutions of Kool- Aid (C 12 H 22 O 11 ) with the following concentrations: 0.2 M, 0.5 M and 1.0 M. Determine the concentration (molarity) of properly prepared Kool-Aid through a taste test. Hypothesis Make an educated guess: Which of the 3 solutions will provide the best tasting drink? 1 m because it has the most koolaid Materials  Kool-Aid powder  C 12 H 22 O 11 (table sugar) – use this ONLY if your Kool-Aid powder is not pre-sweetened  H 2 O (water)  Calculator  Electronic Scale  Measuring cup  4 plastic cups Procedure Part I: 1. Create a data table to record the mass of solute (Kool-Aid) used in grams, color, taste ranking (1-5), and smell description for each solution concentration (0.2 M, 0.5 M, and 1.0 M). Also create a data table to hold the data collected throughout this experiment. Include the data tables in your lab submission. 1. Mix the Kool-Aid (C 12 H 22 O 11 ) exactly following the directions for one serving size. Label cup “Control.” 2. Select your taster(s). Taste the Kool-Aid and rank on a scale of 1–5 (1 = gross and 5 = amazing taste). 3. Measure 1 cup of water. Convert cups into liters. 4. Find the mass of 1 tablespoon of Kool-Aid powder in grams. 5. NOTE: If you are using unsweetened Kool-Aid, also find the mass of 1 cup of sucrose. (You will have to make some adjustments as needed to the directions below to make sure you add the correct amount of sucrose.