Weak bases (B) such as ammonia partially ionize in water to give hydroxyl ions (OH

For example if we have 0.1 M ammonia ( Kb = 1.75×10

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^{-}) and the corresponding conjugate acid (BH^{+}). To calculate pH we need to know the concentration of the weak base (C) in Molar units and its Kb (base ionization constant) then use the following equations:For example if we have 0.1 M ammonia ( Kb = 1.75×10

^{-5 }) solution then if we use the above equation we get pH = 11.12.Related posts:

Online pH calculator

This is obviously the quadratic equation. What happened to the 2a in the denominator?

ReplyDeleteYes. The above equation results from solution of a quadratic equation where a=1, b=Kb, and c=-Kb*C.

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