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– Consider the base dissociation-constant expression for ammonia and the acid dissociation constant expression for its conjugate acid, ammonium ion:

The Kb is the equilibrium constant for the reaction of the base ammonia combining with water to produce ammonium, the conjugate acid, and a hydroxide anion (OH-).

Aqueous ammonia (NH3) is a weak basic solution. pH of NH3 solution is calculated by using Kb value of NH3. Online calculator can be used to check your pH valukb of ammoniaes.

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