
Concept explainers
The butylammonium ion, C4H9NH3+, has a Ka of 2.3 × 10−11.
C4H9NH3+(aq) + H2O(ℓ) ⇄ H3O+(aq) + C4H9NH2(aq)
- a) Calculate Kb for the conjugate base, C4H9NH2 (butyl
amine ). - b) Place the butylammonium ion and its conjugate base in Table 16.2. Name an acid weaker than C4H9NH3+ and a base stronger than C4H9NH3.
- c) What is the pH of a 0.015M solution of butylammonium chloride?
(a)

Interpretation:
Concept Introduction:
Equilibrium constants:
The equilibrium constant is used to quantitative measurement of the strength of the acid and bases in the water.
Relation between pH and pOH
Answer to Problem 92GQ
Explanation of Solution
According to the Brown stead –Lowry theory the compound which is accepts a proton to be considered as a base.
A weak base accepts a proton from water molecules producing hydroxide ions in water.
The
Substitute the values,
Therefore,
(b)

Interpretation:
Compound should be Named for an acid weaker than
Concept Introduction:
Equilibrium constants:
The equilibrium constant is used to quantitative measurement of the strength of the acid and bases in the water .
Relation between pH and pOH
Answer to Problem 92GQ
An acid weaker than
A base stronger than
Explanation of Solution
From the table,
The butyl ammonium ion has
The order of
Butyl amine has a
The
Therefore, An acid weaker than
(c)

Interpretation:
The pH has be calculated for 0.015M solution of butylammonium chloride?
Concept Introduction:
Equilibrium constants:
The equilibrium constant is used to quantitative measurement of the strength of the acid and bases in the water .
Relation between pH and pOH
Answer to Problem 92GQ
The pH of the 0.015M solution of butylammonium chloride is 6.2.
Explanation of Solution
Butylammonium chloride dissociates into butyl ammonium ion and chloride ion. Chloride ion does not affect the solution pH. Butylammonium donate a proton to water to form hydronium ions.
The equilibrium chemical reaction of butylammonium chloride is as follows.
The equilibrium expression:
The initial concentration of ammonium chloride is 0.015M.
Enter the ICE table the concentrations before equilibrium is established, the change that occurs as the reaction proceeds to equilibrium and the concentrations when equilibrium has been achieved.
Hence,
Substitute the values form the ICE table.
Therefore,
Let’s calculate the pH of the solution:
Therefore, pH of butylammonium chloride solution is 6.2.
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Chapter 16 Solutions
Chemistry & Chemical Reactivity, Hybrid Edition (with OWLv2 24-Months Printed Access Card)
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