Textbook Question
A naturally occurring amino acid such as alanine has a group that is a carboxylic acid and a group that is a protonated amine. The pKa values of the two groups are shown.
d. Draw the structure of alanine in a solution at pH = 12.
3. Acids and Bases
Equilibrium Constant
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Which of the following is a correct statement about the equilibrium constant (K) in a chemical reaction?
A
The equilibrium constant changes with the concentration of reactants.
B
The equilibrium constant can be negative.
C
The equilibrium constant is the ratio of the concentrations of products to reactants at equilibrium.
D
The equilibrium constant is independent of temperature.
Verified step by step guidance1
Understand the concept of the equilibrium constant (K): It is a value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given chemical reaction.
Recognize that the equilibrium constant (K) is specific to a particular reaction at a given temperature. It does not change with the concentration of reactants or products, but it can change with temperature.
Note that the equilibrium constant (K) is always a positive value. It cannot be negative because it represents a ratio of concentrations, which are always positive.
Identify that the equilibrium constant (K) is dependent on temperature. Changes in temperature can affect the equilibrium position and thus alter the value of K.
Conclude that the correct statement about the equilibrium constant (K) is: 'The equilibrium constant is the ratio of the concentrations of products to reactants at equilibrium.' This statement accurately describes the nature of K.
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