From lab manual: the pKa of acetic acid is 4.75 and the volume of the vinegar is 21.05. This is a titration of a vinegar samples using a pH meter. Determine the volume of 0.1 M NaOH dispensed furing the tiration. Caclualate the molarity of the aceic acid vinegar. Calulate the pKa of acetic from the midpoint data unsing the Henderson-Hasselbach equations.Please help me understand how to do these calculations I am so lost. Thank you! VinegarSample 1VinegarSample 2VinegarSample 3Calculations forSample 1Moles of NaOHConsumed atMidpoint Reading[A-] (moles)Moles of AceticAcid Remaining atMidpoint [HA](moles)Calculated pkaAverage pkaPercent eror onpk. VinegarSample 1VinegarSample 2VinegarSample 3Calculations forSample 1Initial Buret Reading(mL)2.893.001.61Midpoint pHReading4.8024.8954.687Midpoint BuretReading (mL)11.7412.929.50Final pH Reading8.2388.5318.934Final Buret Reading(mL)20.1220.3119.00Volume of NaOHDispensed (ml)Calculated Molarityof Acetic Acid inthe Vinegar Sample(M = moles/L)Average MolarityAcetic Acid (M =moles/L)Average MassPercent of AceticAcid Concentration(g)Volume NaOHDispensed atMidpoint Reading(ml)

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Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 87AP

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From lab manual: the pKa of acetic acid is 4.75 and the volume of the vinegar is 21.05. This is a titration of a vinegar samples using a pH meter. Determine the volume of 0.1 M NaOH dispensed furing the tiration. Caclualate the molarity of the aceic acid vinegar. Calulate the pKa of acetic from the midpoint data unsing the Henderson-Hasselbach equations.

Please help me understand how to do these calculations I am so lost. Thank you!

Vinegar
Sample 1
Vinegar
Sample 2
Vinegar
Sample 3
Calculations for
Sample 1
Moles of NaOH
Consumed at
Midpoint Reading
[A-] (moles)
Moles of Acetic
Acid Remaining at
Midpoint [HA]
(moles)
Calculated pka
Average pka
Percent eror on
pk.

Vinegar
Sample 1
Vinegar
Sample 2
Vinegar
Sample 3
Calculations for
Sample 1
Initial Buret Reading
(mL)
2.89
3.00
1.61
Midpoint pH
Reading
4.802
4.895
4.687
Midpoint Buret
Reading (mL)
11.74
12.92
9.50
Final pH Reading
8.238
8.531
8.934
Final Buret Reading
(mL)
20.12
20.31
19.00
Volume of NaOH
Dispensed (ml)
Calculated Molarity
of Acetic Acid in
the Vinegar Sample
(M = moles/L)
Average Molarity
Acetic Acid (M =
moles/L)
Average Mass
Percent of Acetic
Acid Concentration
(g)
Volume NaOH
Dispensed at
Midpoint Reading
(ml)

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