객관식
In general chemistry terms, is a typical oven cleaner best classified as an acid or a base?
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17. Acid and Base Equilibrium
Bases Introduction
객관식
Which statement best characterizes a weak base in water?
A
It does not react with water at all and therefore cannot change the pH of a solution.
B
It partially ionizes (partially accepts ) in water, establishing an equilibrium with its conjugate acid.
C
It has a very large value (much greater than ), indicating essentially complete reaction with water.
D
It completely ionizes in water, producing only products and no reactant at equilibrium.
검증된 단계별 안내1
Understand that a weak base in water does not fully react with water molecules; instead, it only partially accepts protons (H\^+) from water.
Recognize that this partial reaction means the weak base establishes an equilibrium between the base and its conjugate acid in solution.
Recall that the equilibrium can be represented by the equation: \(\text{B} + \text{H}_2\text{O} \rightleftharpoons \text{BH}^+ + \text{OH}^-\), where B is the weak base.
Know that the base ionization constant, \(K_b\), for a weak base is less than 1, indicating incomplete ionization and the presence of both reactants and products at equilibrium.
Conclude that a weak base partially ionizes in water, establishing an equilibrium with its conjugate acid, which allows it to change the pH but not as strongly as a strong base.
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