Textbook Question
Morphine is a weak base. A 0.150 M solution of morphine has a pH of 10.7. What is Kb for morphine?
1
views
Ch.16 - Acids and Bases
Chapter 16, Problem 96a,b,d
Determine whether each anion is basic or neutral. For those anions that are basic, write an equation that shows how the anion acts as a base. a. C7H5O2– b. I– d. F–
Verified step by step guidance1
Identify the conjugate acid of each anion. The conjugate acid of an anion is the species formed when the anion gains a proton (H+).
Determine the strength of the conjugate acid. If the conjugate acid is a weak acid, the anion is likely to be basic. If the conjugate acid is a strong acid, the anion is likely to be neutral.
For C7H5O2–, identify the conjugate acid as benzoic acid (C7H6O2), which is a weak acid, indicating that the anion is basic.
For I–, identify the conjugate acid as hydroiodic acid (HI), which is a strong acid, indicating that the anion is neutral.
For F–, identify the conjugate acid as hydrofluoric acid (HF), which is a weak acid, indicating that the anion is basic. Write the equation for the basic behavior of F–: F– + H2O ⇌ HF + OH–.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
1mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Base Theory
Acid-base theory explains the behavior of substances in terms of proton (H+) transfer. According to the Brønsted-Lowry theory, acids are proton donors, while bases are proton acceptors. Understanding this theory is essential for determining whether an anion can act as a base by accepting protons from acids in solution.
Recommended video:
Guided course
02:08
Bronsted-Lowry Acid-Base Theory
Basicity of Anions
The basicity of anions refers to their ability to accept protons and form neutral species. Anions derived from weak acids tend to be basic because they can attract protons, while anions from strong acids are typically neutral. Evaluating the strength of the parent acid helps in predicting the basicity of the anion.
Recommended video:
Guided course
01:53Anion Acidity and Basicity
Equilibrium and Reaction Representation
In chemical reactions, equilibrium represents the state where the forward and reverse reactions occur at the same rate. Writing equations that show how anions act as bases involves illustrating the proton transfer process and the resulting equilibrium. This helps in visualizing the anion's role in acid-base reactions.
Recommended video:
Guided course
07:02Overall Reaction Equilibrium Constant
Related Practice
Textbook Question
Determine if each anion acts as a weak base in solution. For those anions that are basic, write an equation that shows how the anion acts as a base. a. Br– b. ClO– c. CN– d. Cl–
1
views
Textbook Question
Determine whether each anion is basic or neutral. For those anions that are basic, write an equation that shows how the anion acts as a base. c. NO3–
Textbook Question
Determine the [OH–] and pH of a solution that is 0.140 M in F–.