Introduction to General, Organic and Biochemistry

11th Edition

ISBN:9781285869759

Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Chapter8: Acids And Bases

Section: Chapter Questions

Problem 8.42P

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Data Analysis

Base on your titration curve, read the volume of NaOH and pH at the equivalence point (the midpoint of the vertical section of the curve)

mLof NaOH at equivalence point: _______________________________

pH: ____________________________

Calculate the volume of at the half equivalence point (1/2 of the mL at equivalence point): _____________________________

Read the pH at the half equivalence point: ____________________________

For a weak acid, the value of pH at the half equivalence point equals pKa of the weak acid.

pKa of the weak acid is: __________________________

Identify the unknown acid with pKa and molar mass using the following table.

Acid	pK_a	Chemical formula
Crotonic	4.69	C₄H₆O₂
Methylmalonic	3.07	C₄H₆O₄
Diphenylacetic	3.94	C₁₄H₁₂O₂
Picric	~0.4	C₆H₃N₃O₇
Alloxanic	6.64	C₄H₄N₂O₅
methyl-m-aminobenzoic	5.10	C₈H₉NO₂

The unknown acid is : ____________________________

Titration Curve
14
12
10
8
6.
4
2
Plot Area
10
20
30
40
50
60
NaOH
Hd

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