Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that

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The pH scale is logarithmic, meaning each whole number change represents a tenfold change in hydrogen ion concentration. A pH of 4 means the hydrogen ion concentration is 10^-4 M, and a pH of 7 means it is 10^-7 M. Therefore, the concentration of hydrogen ions in solution X is 1,000 times greater than in solution Y, not 30 or 3 times.

Consider Two Solutions: Solution X Has a PH of 4;