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

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-).

Find the relative strength of acids and bases using this chart that includes the K a value for reference. The chart lists ammonia as a weak base with a K a value of 5.8 * 10 -10.

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