A chemistry student is doing a titration lab and needs to make up 2 liters of NaOH for the class and standardize the NaOH with the organic acid KHP (MW 204.2 g/mol). The instructions say 5 grams/ liter of NaOH pellets which is ~ 0.1 M by the molar mass of NaOH. The student weighs out ~ 10 grams of NaOH and dissolves it in 2 liters of water. The student then weighs out 0.4120 g of KHP and puts the organic acid in ~ 50 mL of water and adds ~ 3 drops of 1% phenolphthalein indicator. To reach the endpoint (pink) where moles KHP are used up with NaOH, he adds 17.5 mL of the NaOH from the buret. A. What is the concentration of the NaOH? B. If he repeats this 2 more times and adds 16.9 mL NaOH to a flask with 0.4525 grams KHP and 24.2 mL NaOH to a flask with 0.5250 grams KHP what is the average concentration of the NaOH and the % difference?
A chemistry student is doing a titration lab and needs to make up 2 liters of NaOH for the class and standardize the NaOH with the organic acid KHP (MW 204.2 g/mol). The instructions say 5 grams/ liter of NaOH pellets which is ~ 0.1 M by the molar mass of NaOH. The student weighs out ~ 10 grams of NaOH and dissolves it in 2 liters of water. The student then weighs out 0.4120 g of KHP and puts the organic acid in ~ 50 mL of water and adds ~ 3 drops of 1% phenolphthalein indicator. To reach the endpoint (pink) where moles KHP are used up with NaOH, he adds 17.5 mL of the NaOH from the buret. A. What is the concentration of the NaOH? B. If he repeats this 2 more times and adds 16.9 mL NaOH to a flask with 0.4525 grams KHP and 24.2 mL NaOH to a flask with 0.5250 grams KHP what is the average concentration of the NaOH and the % difference?
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions
Section: Chapter Questions
Problem 139SCQ: Two students titrate different samples of the same solution of HCl using 0.100 M NaOH solution and...
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A chemistry student is doing a titration lab and needs to make up 2 liters of NaOH for the class and standardize the NaOH with the organic acid KHP (MW 204.2 g/mol). The instructions say 5 grams/ liter of NaOH pellets which is ~ 0.1 M by the molar mass of NaOH. The student weighs out ~ 10 grams of NaOH and dissolves it in 2 liters of water. The student then weighs out 0.4120 g of KHP and puts the organic acid in ~ 50 mL of water and adds ~ 3 drops of 1% phenolphthalein indicator. To reach the endpoint (pink) where moles KHP are used up with NaOH, he adds 17.5 mL of the NaOH from the buret.
A. What is the concentration of the NaOH?
B. If he repeats this 2 more times and adds 16.9 mL NaOH to a flask with 0.4525 grams KHP and 24.2 mL NaOH to a flask with 0.5250 grams KHP what is the average concentration of the NaOH and the % difference?
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