Multiple Choice
What is the conjugate acid of the base PO4^3-?
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17. Acid and Base Equilibrium
Acids Introduction
Multiple Choice
Which of the following statements correctly describes strong acids and bases in aqueous solution?
A
For a strong acid in water, [H3O+] can be assumed to be equal to the initial concentration of the acid.
B
A strong acid ionizes to a limited extent in aqueous solution.
C
A strong base is one that has a high concentration.
Verified step by step guidance1
Understand the definition of a strong acid: A strong acid is one that completely ionizes in aqueous solution. This means that when a strong acid is dissolved in water, it dissociates completely into its ions.
Recognize the implication of complete ionization: For a strong acid, the concentration of hydronium ions \( [\text{H}_3\text{O}^+] \) in the solution is equal to the initial concentration of the acid because all the acid molecules donate their protons to water.
Consider the statement about strong acids: 'A strong acid ionizes to a limited extent in aqueous solution' is incorrect because strong acids ionize completely, not to a limited extent.
Understand the definition of a strong base: A strong base is one that completely dissociates in water to produce hydroxide ions \( [\text{OH}^-] \). The strength of a base is not determined by its concentration but by its ability to dissociate completely.
Evaluate the statement about strong bases: 'A strong base is one that has a high concentration' is misleading because the strength of a base is about its complete dissociation, not its concentration. A base can be strong even at low concentrations if it dissociates completely.
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