A solution at pH 3 contains how many more hydrogen ions than a solution at pH 6?
a.30 times more
b.10,000 times more
c.1,000 times more
d.3 times more
Explanation
The pH scale is logarithmic and inverted: each whole-number drop multiplies hydrogen-ion concentration by 10. Going from pH 6 to pH 3 is a 3-unit drop, so 10 x 10 x 10 = 1,000 times more hydrogen ions.
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