Addition of CH3COONa in water gives

Explanation

When CH3COONa (sodium acetate) dissolves in water, it dissociates into CH3COO- and Na+. The acetate ion (CH3COO-) undergoes hydrolysis with water, forming acetic acid (CH3COOH) and hydroxide ions (OH-), thus increasing the concentration of OH- and making the solution basic. Therefore, the correct answer is 'Basic solution.' The other options are incorrect: 'Standard solution' and 'Buffer solution' do not describe the nature of the solution formed, and 'Acidic solution' is incorrect because the formation of OH- results in a basic solution.