When `0.2` mole of an acid is added to `4` lit of a buffer solution, the `P^(H)` of the buffer decreases by `0.5`. What is the buffer capacity of the solution.?

Explanation

Buffer capacity
`=("noofmolesofanacidaddedperlitsolution")/(p^(H)"change")`
0.2 mole of an acid is added to 4. lit of a buffer.
1. lit of a buffer contains how many moles?
`=(1xx0.2)/(4)=0.05" "p^(H)"change"=0.5`
`:.` Buffer capacity `=(0.05)/(0.5)=0.1`