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Is it possible for a chemical to behave as an acid in one instance and as a base in another instance?
Wiki User
∙ 12y ago
Yes, but not at the same time. Such substances are called amphoteric. Their acidic or basic character depends on the substance they are reacting with.
A good example of an amphoteric substance is water.
When water reacts with a substance more basic than itself (like ammonia), it acts as an acid.
H-OH + NH3 --> NH4+ + OH-
When water reacts with a substance more acidic than itself (like hydrochloric acid), it acts as a base.
HCl + H2O --> H3O+ + Cl-
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoYes, this phenomenon is called amphoterism.
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