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Given a scientific passage and an answer, generate a question for the given answer.

Passage: chloride, NaCl. When Na 2 HPO 24 (the weak acid) comes into contact with a strong base, such as sodium hydroxide (NaOH), the weak acid reverts back to the weak base and produces water. Acids and bases are still present, but they hold onto the ions. Answer: water
Output:
When na 2 hpo 24 (the weak acid) comes into contact with a strong base, such as sodium hydroxide (naoh), the weak acid reverts back to the weak base and produces what?