Question

A buffer solution is made using a weak acid, ha, with a pka of 5.28. if the ratio of a– to ha is 1.0 × 102, what is the ph of the buffer?

Answer 1

pH of a buffer solution can be calculated using the following equation:

`pH=pK_(a)+log ([A^(-1)])/([HA])`

pKa is given as 5.28

the ratio of A⁻ to HA is given as 1.0 × 10²

putting all the values in the equation;

pH=5.28+log [1.0 × 10²]

pH=7.28

SO, when a buffer solution is made using a weak acid, HA, with a pka of 5.28. if the ratio of A⁻ to HA is 1.0 × 10², the pH of the buffer is 7.28.