The strong acid HA is mixed with an equal molar amount of aqueous NaOH. Which of the following pictures represents the equilibrium state of the solution? (Na+ ions and solvent water molecules have been omitted for clarity.)

(A) (B) (C) (D)

검증된 단계별 안내

Identify the reaction: HA (strong acid) + NaOH (strong base) -> NaA + H2O.

Since HA is a strong acid, it will completely dissociate into H+ and A- ions.

NaOH will also completely dissociate into Na+ and OH- ions.

In an equimolar mixture, H+ ions from HA will react with OH- ions from NaOH to form water (H2O).

At equilibrium, the solution will contain water molecules and the conjugate base A- (represented by NO3- in the diagrams).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Acid-Base Neutralization

Acid-base neutralization is a chemical reaction where an acid reacts with a base to produce water and a salt. In this case, the strong acid HA reacts with NaOH, a strong base, resulting in the formation of water (H2O) and the conjugate base A-. This process is essential for understanding the equilibrium state of the solution after mixing the two reactants.

Equilibrium in Chemical Reactions

Equilibrium in chemical reactions occurs when the rates of the forward and reverse reactions are equal, leading to constant concentrations of reactants and products. In the context of the question, identifying the equilibrium state involves recognizing the distribution of hydronium ions (H3O+) and hydroxide ions (OH-) after the neutralization reaction has reached completion.

Ionization of Water

The ionization of water is the process where water molecules dissociate into hydronium (H3O+) and hydroxide (OH-) ions. This concept is crucial in understanding the behavior of acids and bases in solution, as the presence of these ions determines the pH and the overall chemical environment. In the equilibrium state, the balance between H3O+ and OH- ions is key to identifying the correct molecular arrangement.

The strong acid HA is mixed with an equal molar amount of aqueous NaOH. Which of the following pictures represents the equilibrium state of the solution? (Na+ ions and solvent water molecules have been omitted for clarity.)(A) (B) (C) (D)