100 mL of a solution contains 2 g of acetic acid and 3 g of sodium acetate providing K_a=1.8 10⁻⁵ , then choose the correct option.

Step-by-step solution

We have the formula for pH pH =- K_a+ [ Salt ] [ Base ] [ Salt ]= 3 1000 82 100 ~mol ~L ⁻¹ and aligned [ Acid ] & = 2 1000 60 100 ~mol ~L ⁻¹ pH & =- 1.8 10⁻⁵+ 3 1000 82 100 2 1000 60 100 pH & =4.7851 aligned