What effect do bases have on indicators like litmus paper?

A. Turn it blue

B. Turn it red

C. Turn it green

D. No effect

Answer Explanation:

Bases turn litmus paper blue. Litmus is a common indicator that changes color in response to the acidity or basicity of a solution. In the presence of a base, litmus paper turns blue.

Therefore, the Correct Answer is A.

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 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.
Q #3: 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 (\(H_2\)).

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What effect do bases have on indicators like litmus paper?

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 statements about the pH of bases is correct?

Answer Explanation

Q #3: Which of the following is a characteristic property of bases?

Answer Explanation

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