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2. Cell Chemistry & Cell Components
pH Scale
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A solution at pH 6 contains __________ than the same amount of solution at pH 8.
A
2 times more H+
B
4 times more H+
C
4 times less H+
D
100 times more H+
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Understand that pH is a measure of the hydrogen ion concentration in a solution, where a lower pH indicates a higher concentration of H+ ions.
Recall that the pH scale is logarithmic, meaning each whole number change on the scale represents a tenfold change in H+ concentration.
Calculate the difference in pH between the two solutions: pH 6 and pH 8. The difference is 2 pH units.
Since the pH scale is logarithmic, a difference of 2 pH units means the concentration of H+ ions is 10^2 times different.
Conclude that a solution at pH 6 has 100 times more H+ ions than a solution at pH 8, because 10^2 equals 100.
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