Respuesta :
The relationship between OH- and COOH in an acetic acid buffer solution involves the potential interaction where OH- can rip off the H+ from COOH. When NaOH is introduced into a buffer solution of acetic acid, the OH- ions can interact with the COOH group. To calculate the pH after adding NaOH, you would subtract the moles of NaOH from the moles of CH3COOH and then calculate the pH using the remaining acetic acid concentration and its corresponding Ka value[1][2].
Buffer capacity in a solution depends on the amounts of the weak acid and its conjugate base present. For instance, a solution with equal concentrations of acetic acid and sodium acetate has a greater buffer capacity compared to a solution with unequal concentrations. The pH of a buffer solution can be calculated using equilibrium calculations, and the initial pH is determined by the concentrations of the components. Weak acids and their salts are effective buffers for pH values below 7, while weak bases and their salts are better for pH values above 7[2].
To calculate the pH of buffer solutions containing acetic acid and sodium acetate, you can use the Henderson-Hasselbalch equation, which involves the pKa of the weak acid and the concentrations of the conjugate base and weak acid. The pKa of acetic acid is 4.74, and by applying the Henderson-Hasselbalch equation, you can determine the pH of the buffer solution based on the concentrations of acetic acid and sodium acetate[3][5].
