Which of following is a correct statement about the relationship between ph and the hydrogen-ion concentration of a solution?
a. There are no hydrogen ions present in a solution with a basic pH
b. There are no hydrogen ions present in a solution with a pH of 7
c. The concentration of hydrogen ions in a solution with a pH of 7 is 100 times greater than that in a solution with a pH of 9
d. The concentration of hydrogen ions in a solution with a pH of 5 is twice that than with a pH of 3
Answer: c