Question

ka value for acetic acid?

Answer 1

[AI-generated answer — Explain Bot]

To find the Ka value for acetic acid (CH3COOH), you can follow these steps:

Step 1: Write out the chemical equation for the ionization of acetic acid in water:

CH3COOH (aq) ⇌ CH3COO- (aq) + H+ (aq)

Step 2: Set up the expression for the equilibrium constant (Ka) using the concentrations of the ions at equilibrium.

Ka = [CH3COO-] [H+] / [CH3COOH]

Step 3: Acetic acid is a weak acid, which means that it does not completely ionize in water. Therefore, you can assume that the initial concentration of acetic acid is equal to the equilibrium concentration of acetic acid ([CH3COOH] = [CH3COOH]eq). Similarly, the concentration of the acetate ion ([CH3COO-]eq) is equal to the concentration of the hydronium ion ([H+]eq) at equilibrium.

Step 4: Measure the initial concentration of acetic acid in moles per liter (M) and determine the concentrations of the acetate ion and hydronium ion at equilibrium.

Step 5: Substitute the equilibrium concentrations into the Ka expression and calculate the value of Ka.

Note that the value of Ka for acetic acid is approximately 1.8 x 10^-5 at 25°C.