Question

What is an example of a pH buffer calculation problem?

Answer 1

pH denotes the power of hydrogen or we can say that it represents potential of hydrogen ions. It is generally a scale which is used to represent that aqueous solution given is acidic in nature, basic in nature or in neutral form.

Complete answer:
Buffer Solution is defined as a water solvent based solution which consists of a mixture containing a weak acid and the conjugate base of the weak acid or a weak base and the conjugate acid of the weak base. Buffer solutions resist a change in pH upon dilution or upon the addition of small amounts of acid or base to them. Buffer index can be defined as the differential ratio of the increase in the amount of strong acid or strong base added with respect to pH variation.
The equation of calculating buffer for acids can be written as follows:
$pH=p{{K}_{a}}+\log [\dfrac{({{A}^{-}})}{(HA)}]$
The equation of calculating buffer for bases can be written as follows:
$pH=p{{K}_{b}}+\log [\dfrac{(B{{H}^{+}})}{(B)}]$
Hence by using these formula we can easily find the pH if we know the value of $p{{K}_{a}}$and $p{{K}_{b}}$or the concentration of acid and bases given in the data.
Thus by taking any example in which $p{{K}_{a}}$or $p{{K}_{b}}$and concentration is given we can find the pH easily.

Note:
Buffer capacity can be numerically expressed to be equal with the minimum concentration of strong acid or strong base which cause the changes in buffer’s pH value by one unit. The pH of Buffer Solutions shows minimum change upon the addition of a very small quantity of strong acid or strong base.