Question

Solutions, Acids, and Bases Online Practice
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Question
Which statement best describes the difference between a substance with a pH of 2.0 versus a substance with a pH of 4.0?(1 point)
Responses

The substance with a pH of 4.0 would have 100 times as many hydrogen ions per volume of water.
The substance with a pH of 4.0 would have 100 times as many hydrogen ions per volume of water.

The substance with a pH of 2.0 would have 100 times as many hydrogen ions per volume of water.
The substance with a pH of 2.0 would have 100 times as many hydrogen ions per volume of water.

The substance with a pH of 4.0 would have twice as many hydrogen ions per volume of water.
The substance with a pH of 4.0 would have twice as many hydrogen ions per volume of water.

The substance with a pH of 2.0 would have twice as many hydrogen ions per volume of water.
The substance with a pH of 2.0 would have twice as many hydrogen ions per volume of water.

Answer 1

The correct statement is:

**The substance with a pH of 2.0 would have 100 times as many hydrogen ions per volume of water.**

This is because the pH scale is logarithmic, meaning each whole number change on the scale represents a tenfold change in hydrogen ion concentration. Therefore, a difference of 2 pH units (from 2.0 to 4.0) corresponds to a difference of 10^2, or 100 times the concentration of hydrogen ions.