Question 2 The coordinated water molecules in complexes such as [M(0H2)6]n+ are a) generally better Bronsted-Lowry acids than free water molecules. Explain why this is so.

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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Question 2
a)
The coordinated water molecules in complexes such as [M(OH2)6]n+ are
generally better Bronsted-Lowry acids than free water molecules. Explain why
this is so.
b)
Likewise, discuss how making the following changes to the complex
would affect its acidity.
i)
Increasing the ionic radius of M
ii)
Increasing the value of n
iii) Replacing one of the complexed water molecules with an ammonia ligand
forming [M(OH2)5NH3]n*.
Transcribed Image Text:Question 2 a) The coordinated water molecules in complexes such as [M(OH2)6]n+ are generally better Bronsted-Lowry acids than free water molecules. Explain why this is so. b) Likewise, discuss how making the following changes to the complex would affect its acidity. i) Increasing the ionic radius of M ii) Increasing the value of n iii) Replacing one of the complexed water molecules with an ammonia ligand forming [M(OH2)5NH3]n*.
The biological systems of various marine life forms may be affected by
the pH of the sea water. Figure 2 is a sketch of the speciation diagram of
carbonic acid system in sea water.
c)
0.8
HCO
co 2-
0.6.
0.4
0.2
4
6
8
10
12
14
pH
Figure 2: Speciation Diagram for carbonic acid
Use the information from Fig 2 to answer the following questions.
i)
What species are in the water at pH 10?
ii)
Determine expressions for ai in terms of ct and in terms of Ka for
carbonic acid
iii)
Estimate the acid dissociation constant (Ka) value for the reaction:
HCO3° = CO32- + H+
Fraction
Transcribed Image Text:The biological systems of various marine life forms may be affected by the pH of the sea water. Figure 2 is a sketch of the speciation diagram of carbonic acid system in sea water. c) 0.8 HCO co 2- 0.6. 0.4 0.2 4 6 8 10 12 14 pH Figure 2: Speciation Diagram for carbonic acid Use the information from Fig 2 to answer the following questions. i) What species are in the water at pH 10? ii) Determine expressions for ai in terms of ct and in terms of Ka for carbonic acid iii) Estimate the acid dissociation constant (Ka) value for the reaction: HCO3° = CO32- + H+ Fraction
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