A weak monobasic acid is 0.04 % dissociated in 0.25 M solution. What is pH of the solution?

Step-by-step solution

Given concentration of the weak monobasic acid, C = 0.25 M. Degree of dissociation, = 0.04 % = 0.04 100 = 4 10⁻⁴ . For a weak monobasic acid, the hydrogen ion concentration is given by: [H^+] = C Substituting the values: [H^+] = 0.25 4 10⁻⁴ = 10⁻⁴ M. The pH of the solution is: pH = - [H^+] pH = - (10⁻⁴) = 4 . Answer: 4