Which one of the following procedures would result in a buffer with ph close to 9.0?
ka(ch3cooh) = 1.8 × 10-5
kb(nh3) = 1.8 × 10-5

mixing 1 mol ch3cooh and 1 mol nh3 in a 1.0 l aqueous solution.

mixing 1 mol ch3cooh and 1 mol naoh in a 1.0 l aqueous solution.

mixing 1 mol nh3 and 0.5 mol hcl in a 1.0 l aqueous solution.

mixing 1 mol ch3cooh and 0.5 mol naoh in a 1.0 l aqueous solution.

mixing 1 mol nh3 and 1 mol hcl in a 1.0 l aqueous solution.