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.

Q #1: How does the reaction of an acid with a base affect the pH of the resulting solution?

A. The pH increases

B. The pH decreases

C. The pH remains unchanged

D. It depends on the specific acid and base

Answer Explanation

When an acid reacts with a base in a neutralization reaction, the pH of the resulting solution remains unchanged if the quantities of acid and base are stoichiometrically balanced. This is because the \(H^+\) ions from the acid react with the \(OH^-\) ions from the base to form water, effectively neutralizing each other.
Q #2: What effect do acids have on indicators like litmus paper?

A. Turn it blue

B. Turn it red

C. Turn it green

D. No effect

Answer Explanation

Acids turn litmus paper red. Litmus is a common indicator that changes color in response to the acidity or basicity of a solution. In the presence of an acid, litmus paper turns red.
Q #3: 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.

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Which of the following statements about strong acids is true?

More Questions on TEAS 7 Science

Q #1: How does the reaction of an acid with a base affect the pH of the resulting solution?

Answer Explanation

Q #2: What effect do acids have on indicators like litmus paper?

Answer Explanation

Q #3: How does the pH of an acidic solution compare to that of a neutral solution?

Answer Explanation

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