A scientist adds a solution of HCl (aq) to a buffer comprised of CH3COOH (aq) and CH3COONa (aq). Which net ionic reaction would initially occur?

Net ionic between HCl and the buffer equation

CH3COOH - -> acetic acid, CH3COO - acetate, H + proton from HCl

there is neutralization of the acetate, and an increase in acid

the ionic equation

CH3COO - (aq) + H + (aq) + Cl - (aq) - -> CH3COOH (aq) + Cl - (aq)

Net ionic:

CH3COO - (aq) + H + (aq) - -> CH3COOH (aq).