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An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with aqueous NaOH and from this determine the molar mass of the unknown acid. The appropriate equations are as follows: Citric acid: H3C6H5O7(aq) + 3NAOH(aq) → 3H2Om + Na3CóH5O7(aq) Tartaric acid: H2C4H4O6{aq) + 2NaOH(aq) →2H2Ou) + Na2C4H4O6laq) A 0.478g sample requires 14.55mL of 0.513 M NaOH to consume the acid completely. What is the unknown acid? (3 pts) What is the pH within the titration flask after adding the initial 2.50mL of NaOH? Note that citric acid is a triprotic acid (Ka1= 8.4*10^(-4) ; Ka2= 1.8*10^(-5); and Ka3= 4.0*10^(-6) ) while tartaric acid is a diprotic acid (Ka1= 1.3*10^(-3); and Ka2= 4.0*10^(-5)). (7 points)

An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with aqueous NaOH and from this determine the molar mass of the unknown acid. The appropriate equations are as follows: Citric acid: H3C6H5O7(aq) + 3NAOH(aq) → 3H2Om + Na3CóH5O7(aq) Tartaric acid: H2C4H4O6{aq) + 2NaOH(aq) →2H2Ou) + Na2C4H4O6laq) A 0.478g sample requires 14.55mL of 0.513 M NaOH to consume the acid completely. What is the unknown acid? (3 pts) What is the pH within the titration flask after adding the initial 2.50mL of NaOH? Note that citric acid is a triprotic acid (Ka1= 8.4*10^(-4) ; Ka2= 1.8*10^(-5); and Ka3= 4.0*10^(-6) ) while tartaric acid is a diprotic acid (Ka1= 1.3*10^(-3); and Ka2= 4.0*10^(-5)). (7 points)

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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An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with aqueous NaOH and from this determine the molar mass of the unknown acid. The appropriate equations are as follows: Citric acid: H3C6H5O7(aq) + 3NAOH(aq) → 3H2O1) + Na3C,H507(aq) Tartaric acid: H2C4H4O6(aq) + 2NaOH(aq) →2H2O1) + N22C4H4O6(aq) A 0.478g sample requires 14.55mL of 0.513 M NaOH to consume the acid completely. What is the unknown acid? (3 pts) What is the pH within the titration flask after adding the initial 2.50mL of NaOH? Note that citric acid is a triprotic acid (Ka1= 8.4*10^(-4) ; Ka2= 1.8*10^(-5); and Ka3= 4.0*10^(-6) ) while tartaric acid is a diprotic acid (Ka1= 1.3*10^(-3); and Ka2= 4.0*10^(-5)). (7 points)
Transcribed Image Text:An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with aqueous NaOH and from this determine the molar mass of the unknown acid. The appropriate equations are as follows: Citric acid: H3C6H5O7(aq) + 3NAOH(aq) → 3H2O1) + Na3C,H507(aq) Tartaric acid: H2C4H4O6(aq) + 2NaOH(aq) →2H2O1) + N22C4H4O6(aq) A 0.478g sample requires 14.55mL of 0.513 M NaOH to consume the acid completely. What is the unknown acid? (3 pts) What is the pH within the titration flask after adding the initial 2.50mL of NaOH? Note that citric acid is a triprotic acid (Ka1= 8.4*10^(-4) ; Ka2= 1.8*10^(-5); and Ka3= 4.0*10^(-6) ) while tartaric acid is a diprotic acid (Ka1= 1.3*10^(-3); and Ka2= 4.0*10^(-5)). (7 points)
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