Question

write a reaction in which water acts as a base

Answer 1

Answer:

This means the water is donating the hydrogen ion, which classifies it as an acid using the Brønsted concept. Good! As these two reactions show, water can act as an acid or a base; molecules (or ions) that can do this are called amphiprotic. When an amphiprotic molecule (or ion) reacts with an acid, it acts as a base.

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Answer 2

Answer: H2O + H2O ⇌ H3O+ + OH.

Explanation:

Here, one molecule of water acts as an acid, donating an H+ and forming the conjugate base, OH−, and a second molecule of water acts as a base, accepting the H+ ion and forming the conjugate acid, H3O+.

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