Chemistrymedium · Past Paper
A solution has a pH of 3. How many times more acidic is it than a solution with pH 5?
A2 times
B10 times
C20 times
D100 times
✓ Correct Answer: D — 100 times
The pH scale is logarithmic; a difference of 1 pH unit represents a 10-fold change in acidity, so 2 units is 10x10=100.
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