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.

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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, not just the answers, I am so lost.  Thank you!

Vinegar
Vinegar
Sample 2
Vinegar
Calculations for
Vinegar
Sample 1
Vinegar
Sample 2
Vinegar
Sample 3
Calculations for
Sample 1
Sample 3
Sample 1
Sample 1
Moles of NaOH
Initial Buret Reading
(mL)
2.89
3.00
1.61
Consumed at
Midpoint Reading
[A-] (moles)
Midpoint pH
4.802
4.895
4.687
Reading
Moles of Acetic
Acid Remaining at
Midpoint [HA]
(moles)
Midpoint Buret
11.74
12.92
9.50
Reading (ml)
Final pH Reading
8.238
8.531
8.934
Calculated pka
Final Buret Reading
20.12
20.31
19.00
(mL)
Average pka
Volume of NaOH
20.12 ml - 2.89 mL
= 17.23 ml
17.23 mL
17.31 mL
17.39 ml
Percent error on
pka
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)
Transcribed Image Text:Vinegar Vinegar Sample 2 Vinegar Calculations for Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Calculations for Sample 1 Sample 3 Sample 1 Sample 1 Moles of NaOH Initial Buret Reading (mL) 2.89 3.00 1.61 Consumed at Midpoint Reading [A-] (moles) Midpoint pH 4.802 4.895 4.687 Reading Moles of Acetic Acid Remaining at Midpoint [HA] (moles) Midpoint Buret 11.74 12.92 9.50 Reading (ml) Final pH Reading 8.238 8.531 8.934 Calculated pka Final Buret Reading 20.12 20.31 19.00 (mL) Average pka Volume of NaOH 20.12 ml - 2.89 mL = 17.23 ml 17.23 mL 17.31 mL 17.39 ml Percent error on pka 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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