Weak Base

Definition

A bases weak is a Base which does not dissociate completely in water: when a base weak B- is put in the presence of Eau, it occurs the following reaction: B- + H2O = BH + OH-. The reaction total but is not balanced (see: Constante of balance and chemical equation), i.e. to have more substance of the right-sided of the reaction, it is necessary to add more basic B- of the left side, but the base remains always present in solution. In an acid couple bases, a weak base is associated with a weak acid. A weak base will change after having collected a H+ proton in a weak acid.

One classifies the weak bases according to their Constante of acidity. The weak bases have a PKa ranging between 3 and 11.Dans a acidobasic reaction, the general outline is the following: a base reacts with acid and is transformed into its Acide combined. the acid also reacts with the base it becomes by yielding a proton its combined Base.

  • a weak base is transformed into its combined acid which is always a Weak acid .
  • a Weak acid always will be transformed into its combined base which is always a weak base.

Example of weak bases

The ion méthanoate, the ion éthanoate are weak bases. There exists much of other weak bases

See too

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