What is it called when a substance produces hydroxide ions (OH-) in water? Chemistry Acids and Bases Acids and Bases 1 Answer mason m · Stefan V. Nov 24, 2015 It is a base. Explanation: Basic solutions create hydroxide ions in water. Bases have a pH between 7 and 14. This is opposed to an acid, which creates hydronium ions, #"H"_3"O"^(+)#, in water, and has a pH from 0-7. Answer link Related questions How do resonance structures affect acidity? How does carbon dioxide change the acid-base condition of a solution? Why do strong acids have a low pH? Is neutralization a double replacement reaction? Why is NaH a strong base? Is HBr a strong acid? Is HF a strong acid? Why does neutralization occur? Do strong acids completely dissociate in water? How can I calculate pH of weak acid? See all questions in Acids and Bases Impact of this question 12762 views around the world You can reuse this answer Creative Commons License