A change from pH 5 to pH 7 represents how much of a change in hydrogen ion concentration?
a.2 times less acidic
b.10 times less acidic
c.100 times less acidic
d.No change
Explanation
The pH scale is logarithmic, so each whole number is a tenfold change. Two units (pH 5 to pH 7) means the solution is 10 x 10 = 100 times less acidic.
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