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Which of the following statements about strong acids is true?

A. They have a low dissociation constant (Ka)

B. They completely dissociate in solution

C. They are poor conductors of electricity

D. They have a pH greater than 7

Answer Explanation:

Strong acids completely dissociate into ions when dissolved in water, resulting in a high concentration of \(H^+\) ions in solution. This complete ionization distinguishes them from weak acids.

Therefore, the Correct Answer is B.

More Questions on TEAS 7 Science

  • Q #1: How does the pH of an acidic solution compare to that of a neutral solution?

    A. The pH of an acidic solution is lower than that of a neutral solution

    B. The pH of an acidic solution is higher than that of a neutral solution

    C. The pH of an acidic solution is the same as that of a neutral solution

    D. The pH of an acidic solution is unpredictable

    Answer Explanation

    The pH scale ranges from 0 to 14, where pH values less than 7 indicate acidic solutions. Therefore, the pH of an acidic solution is lower than that of a neutral solution, which has a pH of 7.

  • Q #2: What happens to the conductivity of a weak acid solution as it becomes more diluted?

    A. Conductivity increases

    B. Conductivity decreases

    C. Conductivity remains constant

    D. It depends on the acid

    Answer Explanation

    As a weak acid solution becomes more diluted, the concentration of ions decreases, leading to a decrease in conductivity. Weak acids only partially ionize in solution, resulting in fewer ions available to conduct electricity.

  • Q #3: Which of the following statements about strong acids is true?

    A. They have a low dissociation constant (Ka)

    B. They completely dissociate in solution

    C. They are poor conductors of electricity

    D. They have a pH greater than 7

    Answer Explanation

    Strong acids completely dissociate into ions when dissolved in water, resulting in a high concentration of \(H^+\) ions in solution. This complete ionization distinguishes them from weak acids.