Experiment : You took 0.51 g of an unknown weak organic acid and dissolved it in 50. ml of water.Then titrated the solution with 0.100 M NAOH and measured the pH after adding 5.00 ml increments ofthe base, and collected the following data.NaOH (ml) PH0.02.455.02.9510.03.9215.04.0520.04.3525.08.1035.012.0140.012.2045.012.5050.012.8 Use the Excel spread sheet and plot :pH ( Y-axis ) ---- volume ( X-axis )• Determine the equivalence point from the plot )Find the half equivalence point(from the plot )Determine the molar mass of the unknown acidDetermine the Ka of the acid.Equivalence PointNaOH ( ml )mol NaOHMol Acidg acid usedMolar mass of acidHalf-equivalence pointpHpkaКа

Given: Mass of acid = 0.51 g Volume of solution = 50 mL = 0.050 L…

Experiment: You took 0.51 g of an unknown weak organic acid and dissolved it in 50. ml of water. Then titrated the solution with 0.100 M NaOH and measured the pH after adding 5.00 ml increments of the base, and collected the following data. NaOH (ml) PH 0.0 2.45 5.0 2.95 10.0 3.92 15.0 4.05 20.0 4.35 25.0 8.10 35.0 12.01 40.0 12.20 45.0 12.50 50.0 12.8

Experiment: You took 0.51 g of an unknown weak organic acid and dissolved it in 50. ml of water. Then titrated the solution with 0.100 M NaOH and measured the pH after adding 5.00 ml increments of the base, and collected the following data. NaOH (ml) PH 0.0 2.45 5.0 2.95 10.0 3.92 15.0 4.05 20.0 4.35 25.0 8.10 35.0 12.01 40.0 12.20 45.0 12.50 50.0 12.8

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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Arrhenius Acid

Arrhenius acid act as a good electrolyte as it dissociates to its respective ions in the aqueous solutions. Keeping it similar to the general acid properties, Arrhenius acid also neutralizes bases and turns litmus paper into red.

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Bronsted-Lowry base in inorganic chemistry is any chemical substance that can accept a proton from the other chemical substance it is reacting with.

Question

Experiment : You took 0.51 g of an unknown weak organic acid and dissolved it in 50. ml of water.
Then titrated the solution with 0.100 M NAOH and measured the pH after adding 5.00 ml increments of
the base, and collected the following data.
NaOH (ml) PH
0.0
2.45
5.0
2.95
10.0
3.92
15.0
4.05
20.0
4.35
25.0
8.10
35.0
12.01
40.0
12.20
45.0
12.50
50.0
12.8

Use the Excel spread sheet and plot :
pH ( Y-axis ) ---- volume ( X-axis )
• Determine the equivalence point from the plot )
Find the half equivalence point
(from the plot )
Determine the molar mass of the unknown acid
Determine the Ka of the acid.
Equivalence Point
NaOH ( ml )
mol NaOH
Mol Acid
g acid used
Molar mass of acid
Half-equivalence point
pH
pka
Ка

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