Long Answer: Ascorbic acid (Vitamin C) is a monoprotic weak acid with a pka of 4.17. When a 25.00mL aliquot of ascorbic acid was titrated with a 0.1536M NaOH (standardized) solution, it took 36.85mL of the titrant to reach the endpoint as identified using phenolphthalein indicator. Use this information to: a) Calculate the concentration of ascorbic acid, to the correct number of significant figures. b) Determine the initial pH of the solution. Present your answer to 2 decimal places, and identify any simplifications made.. c) Determine the pH of the solution at the equivalence point. Present your answer to 2 decimal places, and identify any simplifications made. [
Long Answer: Ascorbic acid (Vitamin C) is a monoprotic weak acid with a pka of 4.17. When a 25.00mL aliquot of ascorbic acid was titrated with a 0.1536M NaOH (standardized) solution, it took 36.85mL of the titrant to reach the endpoint as identified using phenolphthalein indicator. Use this information to: a) Calculate the concentration of ascorbic acid, to the correct number of significant figures. b) Determine the initial pH of the solution. Present your answer to 2 decimal places, and identify any simplifications made.. c) Determine the pH of the solution at the equivalence point. Present your answer to 2 decimal places, and identify any simplifications made. [
Chemistry
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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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Transcribed Image Text:Long Answer: Ascorbic acid (Vitamin C) is a monoprotic weak acid with a pka of 4.17. When a 25.00mL aliquot of ascorbic acid was
titrated with a 0.1536M NaOH (standardized) solution, it took 36.85mL of the titrant to reach the endpoint as identified using
phenolphthalein indicator. Use this information to:
a) Calculate the concentration of ascorbic acid, to the correct number of significant figures.
b) Determine the initial pH of the solution. Present your answer to 2 decimal places, and identify any simplifications made. [.
c) Determine the pH of the solution at the equivalence point. Present your answer to 2 decimal places, and identify any simplifications
made. [
d) Draw the approximate titration curve for this titration, using pH (y-axis) and Volume of NaOH (mL) (x-axis). [^
e) On the titration curve in c) above, identify the exact pH and Volume of NaOH Added at the half equivalence point. [
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