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A Chemistry student is asked to predict the pH of a potassium hydroxide solution when 1.82 g of potassium hydroxide is dissolved in 250 mL of water. He shows the steps of his calculations as follows: 1KOH == n 1.82 g 56.11 g/mol 0.032 43...mol KOH n 0.03243...mol = Скон = 0.000 129 7...mol/L KOH V 250 mL [KOH(aq)] = [OH(aq)] because it is a 1:1 ratio and 100% dissociation [OH (aq)] = 0.000 129 7...mol/L pH = -log[OH(aq)] = -log(0.000 129 7...mol/L) = 3.8869... pH = 3.897 Identify the three mistakes that the student made in his calculations. Correct the mistakes and provide the correct answer.

A Chemistry student is asked to predict the pH of a potassium hydroxide solution when 1.82 g of potassium hydroxide is dissolved in 250 mL of water. He shows the steps of his calculations as follows: 1KOH == n 1.82 g 56.11 g/mol 0.032 43...mol KOH n 0.03243...mol = Скон = 0.000 129 7...mol/L KOH V 250 mL [KOH(aq)] = [OH(aq)] because it is a 1:1 ratio and 100% dissociation [OH (aq)] = 0.000 129 7...mol/L pH = -log[OH(aq)] = -log(0.000 129 7...mol/L) = 3.8869... pH = 3.897 Identify the three mistakes that the student made in his calculations. Correct the mistakes and provide the correct answer.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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A Chemistry student is asked to predict the pH of a potassium hydroxide solution when 1.82 g of potassium hydroxide is dissolved in 250 mL of water. He shows the steps of his calculations as follows: n 1KOH == 1.82 g 56.11 g/mol 0.032 43...mol KOH n 0.03243...mol = CKOH= 0.000 129 7...mol/L KOH V 250 mL [KOH(aq)] = [OH(aq)] because it is a 1:1 ratio and 100% dissociation [OH(aq)] = 0.000 129 7...mol/L pH = -log[OH(aq)] = -log(0.000 129 7...mol/L) = 3.8869... pH = 3.897 Identify the three mistakes that the student made in his calculations. Correct the mistakes and provide the correct answer.
Transcribed Image Text:A Chemistry student is asked to predict the pH of a potassium hydroxide solution when 1.82 g of potassium hydroxide is dissolved in 250 mL of water. He shows the steps of his calculations as follows: n 1KOH == 1.82 g 56.11 g/mol 0.032 43...mol KOH n 0.03243...mol = CKOH= 0.000 129 7...mol/L KOH V 250 mL [KOH(aq)] = [OH(aq)] because it is a 1:1 ratio and 100% dissociation [OH(aq)] = 0.000 129 7...mol/L pH = -log[OH(aq)] = -log(0.000 129 7...mol/L) = 3.8869... pH = 3.897 Identify the three mistakes that the student made in his calculations. Correct the mistakes and provide the correct answer.
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