To determine the pOH of a hydrochloric acid (HCl) solution, you need to know the concentration of hydroxide ions (OH−OH^-OH−) in the solution. However, HCl is a strong acid that dissociates completely in water, meaning it does not contribute any hydroxide ions. Instead, it produces hydrogen ions (H+H^+H+). Therefore, the concentration of hydroxide ions in an HCl solution is negligible.
In this case, you have a 0.0235 M HCl solution. Since HCl does not produce hydroxide ions, the concentration of hydroxide ions is essentially zero. As a result, the pOH of the solution is also zero.
Thus, the pOH of a 0.0235 M HCl solution is 0.