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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 & Chemical Reactivity
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 74PS: An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you...
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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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