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Which statement best describes the difference between a substance with a pH of 3

.0 and a substance with a ph of 6.0? (1 point)
The substance with the lower pH has 1,000 times as many hydrogen ions per volume of water.
The substance with the higher pH has 1,000 times as many hydrogen ions per volume of water.
The substance with the lower pH has twice as many hydrogen ions per volume of water.
The substance with the higher pH has twice as many hydrogen ions per volume of water.

1 answer

The statement that best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0 is:

The substance with the lower pH has 1,000 times as many hydrogen ions per volume of water.

This is because the pH scale is logarithmic, meaning each whole number change on the pH scale represents a tenfold (10x) change in hydrogen ion concentration. Therefore, a change from pH 3.0 to pH 6.0 (which is 3 units) results in a change of 10^3, or 1,000 times more hydrogen ions in the pH 3.0 solution compared to the pH 6.0 solution.