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.

Therefore, the Correct Answer is A.

Q #1: How do bases affect the solubility of certain substances, such as fats and oils?

A. Bases decrease the solubility

B. Bases increase the solubility

C. Bases have no effect on solubility

D. It depends on the specific substance

Answer Explanation

Bases increase the solubility of certain substances like fats and oils. This property is utilized in the process of saponification, where bases (such as sodium hydroxide) react with fats to produce soap and glycerol.
Q #2: 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.
Q #3: 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.

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Which of the following statements about the pH of bases is correct?

More Questions on TEAS 7 Science

Q #1: How do bases affect the solubility of certain substances, such as fats and oils?

Answer Explanation

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

Answer Explanation

Q #3: What is the effect of bases on the pH of a solution?

Answer Explanation

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