What will be the `pH` if `0.01 mol` of `HCI` is dissolved in the above buffer solution? Find the change in `pH` value.

Explanation

Now `0.01` mol of `HCI ([H^(o+)] = 0.01M)` is added to `1L` of buffer, this will recat acetate ion `(CH_(3)COO^(Θ))` as:
`{:(CH_(3)COO^(Θ)+,H^(o+)rarr,CH_(3)COOH,,),(0.02,0.01,0.1,,),(0.01,,0.11,,):}`
`rArr [acid] = 0.11M` and `["salt"] = 0.01M [V = 1.0L]`
`rArr pH_("new") = pK_(a) + "log" (0.01)/(0.11)`
`= 4.7 + (-1.04) = 3.66 ["use" log 11 = 1.04]`
`rArr` Change in `pH = 3.66 - 4.0 =- 0.34`