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25haubnerh

Answer:

Hydroxide ion (OH^-)

Explanation: A base is a substance which dissolves in water to produce hydroxide ion(OH^-) as the only negative ion.

Eduard22sly

Answer:

Hydroxide ion (OH^-)

Explanation:

A base is a substance which dissolves in water to produce hydroxide ion(OH^-) as the only negative ion. Thus, a base will contribute OH^- when dissolve in water. For instance, NaOH is a strong base and we give out OH^- when dissolve in water as shown below:

NaOH <==> Na^+ + OH^-

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