• Georgia Cyber Academy

• SCIENCE 203

 . 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/ liter of substance, or Molarity. Materials:  Kool-Aid Powder with SUGAR already included (or sugar if you don’t have kool-aid)  Something to stir solutions  4 large cups  measuring cup (ml preferred but cups will work) Instructions: In this activity you will be making a series of kool-aid solutions. Make sure to record all data and answer all the questions below. Step 1: You will prepare a 237.5 ml kool-aid solution with a concentration of 1M. The molar mass of kool-aid (or sugar since kool-aid is basically sugar C12H22O11.) is 342 g/mol. Show the calculations below which helped you create your 1M solution. Note: 237.5 mL is approximately one cup. Demonstration: http://youtu.be/nd-X-s--jLU 237.5 mL 0.2375 L Liters of water needed: 0.2375 L Molarity of kool-aid needed: 1M 237.5 ml, 1M = 1 mol/1L, 324g/1 mol 237.5mL 1 ∗1L 1000mL ∗1mol 1L ∗324 g 1mol 237.5 mL 1 ∗1L 1000 mL ∗1mol 1L ∗324 g 1mo l 237.5∗1∗1∗324 1∗1000∗1∗1 = 76950 1000 =76.95 g Grams of kool-aid needed: 76.95 g Now prepare the solution and make sure to label it (sticky note, pen on plastic cup, piece of paper under cup, etc…) To make this solution: 1. Measure approximately ½ dry cups of the Kool-aid mixture. 2. Pour the Kool-aid powder you measured into a large glass or cup. 3. Measure out the appropriate amount of water (1 cup) and mix into your glass/cup. 5. Stir to mix and label with the appropriate molarity. 6. Don’t taste test it yet, that will come later. Do not discard the leftover 1M solution; we are not done with it yet!