A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of ________________?
Correct answer: C. 1000
- A. 3
- B. 100
- C. 1000
- D. None of these
Explanation
A pH decrease of one unit means a tenfold increase in hydrogen-ion concentration. The difference between pH 2 and pH 5 is three units, so the pH 5 solution is 10³, or 1000 times, less acidic.
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