Consider the weak bases below and their Kp values: Ky = 1.8 x 10-5 Kp = 5.6 x 10-4 10-9 NH3 C2H5NH2 C5H5N Kp = 1.7 x Arrange the conjugate acids of these weak bases in order of increasing acid strength. O CsH;NH*< NH,*< C2H5NH3* O C2H;NH,*= NH4* = C5H;NH* O C,H;NH;*< NH,*< C5H5NH* NH,*< C2H5NH3*

Consider the weak bases below and their Kp values: Ky = 1.8 x 10-5 Kp = 5.6 x 10-4 10-9 NH3 C2H5NH2 C5H5N Kp = 1.7 x Arrange the conjugate acids of these weak bases in order of increasing acid strength. O CsH;NH< NH,< C2H5NH3* O C2H;NH,= NH4 = C5H;NH* O C,H;NH;< NH,< C5H5NH* NH,< C2H5NH3

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 12.66PAE

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

Consider the weak bases below and their Kp values:
NH3
Ky = 1.8 x 10-5
C2H5NH2
Kp = 5.6 x 10-4
C5H5N
Kp = 1.7 x 10-9
Arrange the conjugate acids of these weak bases in order of increasing acid strength.
O CsH;NH< NH,*< C2H5NH3*
C2H5NH;*= NH,= C5H5NH*
C2H5NH3*< NH4*< C5H5NH*
O NH,*< C,H5NH;*<C5H5NH*

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Amino acids are an important group of compounds. At low pH, both the carboxylic acid group (CO2H) and the amine group (NHR) are protonated. However, as the pH of the solution increases (say, by adding base), the carboxylic acid proton is removed, usually at a pH between 2 and 3. In a middle range of pHs, therefore, the amine group is protonated, but the carboxylic acid group has lost the proton. (This is called a zwitterion.) At more basic pH values, the amine proton is dissociated. What is the pH of a 0.20 M solution of alanine hydrochloride, [NH3CHCH3CO2H]Cl?
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