Which of the following is a characteristic property of bases?

A. Sour taste

B. Reaction with metals to release water

C. Turn phenolphthalein pink

D. Donate protons

Answer Explanation:

One of the characteristic properties of bases is their ability to react with certain metals to release hydrogen gas. This reaction is not as common or vigorous as the reaction of acids with metals but is still a defining property of bases. An example of this reaction is the reaction between sodium hydroxide (\(NaOH\)) and aluminum (\(Al\)), which produces hydrogen gas (\(H_2\)).

Therefore, the Correct Answer is C.

Q #1: What is the effect of bases on the pH of a solution?

A. Bases increase the pH

B. Bases decrease the pH

C. Bases have no effect on the pH

D. It depends on the concentration of the base

Answer Explanation

Bases increase the pH of a solution. As bases ionize in water, they release hydroxide ions (\(OH^-\)), which react with \(H^+\) ions from water, thereby decreasing the concentration of \(H^+\) ions and increasing the pH.
Q #2: Which of the following properties is a characteristic of bases?

A. React with metals to release hydrogen gas

B. Turn litmus paper red

C. Have a sour taste

D. Conduct electricity in solution

Answer Explanation

Bases do not react with metals to release hydrogen gas. This property distinguishes them from acids, which do react with metals to produce hydrogen gas.
Q #3: Which of the following statements about the pH of bases is correct?

A. Bases have a pH greater than 7

B. Bases have a pH equal to 7

C. Bases have a pH less than 7

D. Bases have a pH of 7 and can vary based on concentration

Answer Explanation

Bases have a pH greater than 7 on the pH scale, indicating their alkaline nature. The pH of a base solution increases as the concentration of hydroxide ions (\(OH^-\)) increases.

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Which of the following is a characteristic property of bases?

More Questions on TEAS 7 Science

Q #1: What is the effect of bases on the pH of a solution?

Answer Explanation

Q #2: Which of the following properties is a characteristic of bases?

Answer Explanation

Q #3: Which of the following statements about the pH of bases is correct?

Answer Explanation

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