Question

The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. A basic solution has a pH of 11.2. An acidic solution has a pH of 2.4. What is the approximate difference in the concentration of hydrogen ions between the two solutions?
a) 1.6*10^-9
b) 4.0*10^-3
c)6.7*10^-1
D)1.6*10^-11

Answer 1

hints:
pH=-log[H+] (log base 10)
take the inverse
[H+]=10^(-pH)
So you can calculate [H+] for each case and take the difference.

Answer 2

hints:
pH=-log[H+] (log base 10)
take the inverse
[H+]=10^(-pH)
So you can calculate [H+] for each case and take the difference.

Btw, posting this under chemistry will get faster response.