KCET2011ChemistryIonic Equilibrium
A buffer solution contains 0.1 mole of sodium acetate dissolved in 1000 ~cm ³ of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is
Options
- Ap K_ a
- Bp K_ a +2
- Cp K_ a - 2
- Dp K_ a + 2
Correct answer
D. p K_ a + 2
Step-by-step solution
pH = p K_ a + [salt] [acid] When extra 0.1 mole sodium acetate is added [salt ]=0.2 ~mol dm^ -3 [acid] =0.1 ~mol dm ⁻³ pH = p K_ a + [0.2] [0.1] pH = p K_ a + 2