Multiple Choice
Which of the following statements best describes the main difference between diffusion and facilitated diffusion in the context of acids and bases?
3. Acids and Bases
Acids and Bases
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Which of the following is a measure of the strength of an acid in solution?
A
pKa
B
pH
C
pOH
D
pKb
Verified step by step guidance1
Understand the concept of acid strength: Acid strength refers to the tendency of an acid to donate a proton (H⁺) in solution. Strong acids dissociate completely in water, while weak acids do not.
Learn about pKa: The pKa value is a measure of the strength of an acid. It is the negative logarithm of the acid dissociation constant (Ka). Mathematically, it is expressed as . A lower pKa value indicates a stronger acid.
Differentiate between pKa and pH: While pKa measures the intrinsic strength of an acid, pH measures the acidity of a solution, which depends on the concentration of hydrogen ions (H⁺) in the solution. pH is calculated as .
Understand pOH and pKb: pOH is related to the concentration of hydroxide ions (OH⁻) in a solution, calculated as . pKb is the measure of the strength of a base, similar to pKa for acids.
Identify the correct measure for acid strength: Given the options, pKa is the correct measure of the strength of an acid in solution, as it directly relates to the acid's ability to donate protons.
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