Charlie is drinking a cup of soup which has a pH of 8. Jack is drinking a cup of orange juice with a pH of 6. which item has more free H+ ions? Approximately how many more H+ ions does the drink with more have?
pH = -log[H+] therefore lower pHs contain more H+ ions, so Jack's soup contains more free H+. Since pH is a logarithmic scale and Jack's soup has a pH of 2 less than Charlie's, it contains 10^2 = 100 times more H+ ions.
