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
`= ("no. of moles of an acid added per lit solution")/(P^(H)"change")`
`0.2` moles of an acid is added to `4` lit of a bufer `1` lit of a buffer contains how many moles
`= (1 xx 0.2)/(4) = 0.05`
`P^(H)` change `= 0.5`
`:.` Buffer capacity `= (0.05)/(0.5) = 0.1`