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
Explanation
pH is a logarithmic scale. The difference in acidity is calculated by $10^{(pH_2 - pH_1)}$. For pH 5 and pH 2, the factor is $10^{(5-2)} = 10^3 = 1000$.