Answer:
Solution with a pH = 1
Explanation:
So the pH equation is pH = -log[H+]. To get the [H+] (hydrogen ion concentration), you rearrange to get [H+] = 10^-pH.
Solution with a pH = 1
, [H+] = .1 M
Solution with a pH = 12
, [H+] = 1*10^-12 M
Solution with a pH = 7
, [H+] = 1*10^-7 M
Solution with a pH = 9
, [H+] = 1*10^-9 M
Solution with a pH = 5, [H+] = 1*10^-5 M
Another way to get the answer: a high hydrogen ion concentration means that the solution should be more acidic. The most acidic pH of the 5 solutions is the one with a pH = 1.
