Calculate the pH of buffer solution containing 0:027M weak acid and 0.054 M of its salt with strong base if pK _ a is 4.2 .

Step-by-step solution

For an acidic buffer solution, aligned pH & = pK _ a + ₁₀ [ Salt ] [ Acid ] & =4.2+ ₁₀ 0.054 0.027 =4.2+ ₁₀ 2 pH & =4.2+0.3010=4.50 aligned