[poll id=”124″]
ANSWER: D. 315x more acidic
There is a difference of pH of 2.5. We know that difference is acidity can be calculated with 10^x, where x = difference in acidity.
10^(2.5) is a number you cannot calculate in your head without a calculator. But, you know 10^2 = 100, and 10^3 = 1000. Thus, you know the answer relies between 100 and 1000, and there is one answer choice that is in between those 2 values (but not the actual values).