A buffer solution is prepared by mixing equimolar acetic acid and sodium acetate. If ' K _ a ' of acetic acid is 1.78 10⁻⁵ , find the pH of buffer solution.

Step-by-step solution

For acidic buffer, aligned pH & = pK _ a + ₁₀ [ Salt ] [ Acid ] = pK _ a + ₁₀ 1 1 = pK _ a pK _ a & =- ₁₀ ~K _ a =- ₁₀ (1.78 10⁻⁵ ) & =- ( ₁₀ 1.78+ ₁₀ 10⁻⁵ ) & =-(0.25-5)=4.75 aligned Therefore, pH of buffer solution =4.75