How many times stronger is the hydrogen-ion concentration of a pH 4 solution as compared with a pH 9 solution?

0.00001

100,000

Answer and Explanation

The Correct Answer is C

The correct answer is c. 100,000. The pH scale is a logarithmic scale, which means that each change of one pH unit represents a tenfold change in the hydrogen-ion concentration. A pH 4 solution has a hydrogen-ion concentration that is 10^5 (or 100,000) times greater than that of a pH 9 solution.

A. 0.00001 is the hydrogen-ion concentration of a pH 9 solution as compared with a pH 4 solution.

B. 5 is the diﬀerence in pH units between a pH 4 solution and a pH 9 solution.

D. 50 is not the correct answer.

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Correct Answer is D

Explanation

Carbonic acid. When blood pH rises, carbonic acid can donate H+ ions to act as a buﬀer and help maintain the pH within a normal range. Carbonic acid is formed when carbon dioxide dissolves in water and reacts with it.

A. Oxygen is not responsible for donating H+ ions to act as a buﬀer when blood pH rises.

B. Carbon monoxide is a toxic gas that does not play a role in buﬀering blood pH.

C. Carbon dioxide can dissolve in water to form carbonic acid, which can then donate H+ ions to act as a buﬀer.

A. Thylakoid B. Epithelial C. Nuclear D. Tonoplast

Correct Answer is A

Explanation

Thylakoid: Membrane-bound compartments inside chloroplasts where the light-dependent reactions of photosynthesis occur. Like the mitochondrial inner membrane, it is involved in energy transformation processes

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How many times stronger is the hydrogen-ion concentration of a pH 4 solution as compared with a pH 9 solution?

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Naxlex Comprehensive Predictor Exams

Which of the following substances is responsible for donating H+ ions to act as a buﬀer when blood pH rises?

Correct Answer is D

Explanation

The mitochondrial inner membrane carries out the same function in cellular respiration as the ......... membrane of chloroplasts in photosynthesis. Which of the following correctly completes the sentence above?

Correct Answer is A

Explanation

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How many times stronger is the hydrogen-ion concentration of a pH 4 solution as compared with a pH 9 solution?

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