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: 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 #2: How do bases affect the feel of the solution?

A. Bases make the solution feel sticky

B. Bases make the solution feel slippery

C. Bases have no effect on the feel of the solution

D. It depends on the concentration of the base

Answer Explanation

Bases make the solution feel slippery or soapy to the touch. This is due to the formation of soap-like substances when bases react with fatty acids.
Q #3: 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.

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

More Questions on TEAS 7 Science

Q #1: What effect do bases have on indicators like litmus paper?

Answer Explanation

Q #2: How do bases affect the feel of the solution?

Answer Explanation

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

Answer Explanation

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