Question: what is the difference in h+ concentration between ph 2 & ph 5?
Answer: The ph scale is a logarithmic scale. Therefore, a difference of one pH unit is a tenfold difference in hydrogen ion concentration. ... That is because a pH of 4 is 10 times more acidic than a pH of 5, 100 times more acidic than a pH of 6 and 1000 times more acidic than a ph of 7.