Question: are hydrogen ions in pure water?
Answer: In pure water, the hydrogen ion concentration, [H+], equals the hydroxide ion concentration, [OH-]. ... The pH of pure water is 7, the negative logarithm of 1 X 10-7. A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M.