Question

In Part 1 of Lab 2 you will make and standardize a solution of NaOH(aq). Suppose in the lab you measure the solid NaOH and dissolve it into 100.0 mL of water. You then measure 0.2013 g of KHP (KC8H5O4, 204.22 g/mol) and place it in a clean, dry 100-mL beaker, and then dissolve the KHP in about 25 mL of water and add a couple of drops of phenolphthalein indicator. You titrate this with your NaOH(aq) solution and find that the titration requires 9.91 mL of NaOH(aq).

Part 1: What is the concentration of your NaOH(aq) solution? ___________M NaOH Part 2: You will then make a Kool-Aid solution by dissolving the powder in an entire packet of lemon-lime Kool-Aid in 250.00 mL solution. You find the powder in a packet of lemon-lime Kool-Aid has a mass of 3.646 g.

In Part 2 of the lab you titrate 5.00 mL of the lemon-lime Kool-Aid (with 5 drops of thymol blue indicator) with your NaOH(aq) solution. The titration requires 10.07 mL of NaOH(aq). Determine the number of moles of NaOH(aq) required to titrate 5.00 mL of your Kool-Aid solution. _____mol NaOH

Part 3: Determine the number of moles of NaOH(aq) that would be required to titrate 250.00 mL of your Kool-Aid solution (the entire packet). __________mol total acid

Part 4: In Part 3 of the lab you titrate 25.00 mL of the lemon-lime Kool-Aid (with KI, HCl, and starch) with 0.001000 M KIO3(aq) solution. The titration requires 10.10 mL of KIO3(aq). Determine the number of moles of ascorbic acid in 25.00 mL of your Kool-Aid solution. _________mol ascorbic acid

Part 5: Determine the number of moles of ascorbic acid in 250.00 mL of your Kool-Aid solution (the entire packet). ______mol ascorbic acid

Part 6: If you titrated the entire packet of Kool-Aid, how many moles of NaOH(aq) would be neutralized in the titration due to the ascorbic acid? ________mol NaOH

Part 7: To titrate the entire packet of Kool-Aid, how many moles of NaOH(aq) would be neutralized in the titration due to the citric acid? _______mol NaOH

Part 8: Determine the number of moles of citric acid in the packet of Kool-Aid solution. ______mol citric acid

Part 9: Determine the mass (in mg) of ascorbic acid (C6H8O6) in your packet of lemon-lime Kool-Aid. ____________mg ascorbic acid

Part 10: Determine the mass (in g) of citric acid (C6H8O7) in your packet of lemon-lime Kool-Aid. ________g citric acid

Part 11: Determine the % by mass ascorbic acid in lemon-lime Kool-Aid. ___________% ascorbic acid

Part 12: Determine the % by mass citric acid in lemon-lime Kool-Aid. _______% citric acid

Part 13: Each packet of Kool-Aid contains 8 servings. Consider 8 to be an exact number. Determine the mass (in mg) of ascorbic acid (C6H8O6) in one serving of lemon-lime Kool-Aid. ________mg ascorbic acid

Part 14: Determine the mass (in g) of citric acid (C6H8O7) in one serving of lemon-lime Kool-Aid. _____g citric acid

Part 15: The recommended dietary allowance (RDA) for ascorbic acid (vitamin C) is 70 mg. Consider 70 mg to be an exact number. What percent of RDA for ascorbic acid (C6H8O6) is in one serving of lemon-lime Kool-Aid? ________%RDA vitamin C

Answer 1