Help me out with my homework

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Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.

‘which reaction would most likely require the use of an inert electrode?