Final answer:
The pH of an aqueous Fe(NO3)3 solution at 25°C can be determined by calculating the hydronium ion concentration.
Step-by-step explanation:
The pH of an aqueous Fe(NO3)3 solution at 25°C can be determined by calculating the hydronium ion concentration. Fe(NO3)3 dissociates in water to form Fe3+ ions and NO3- ions. Since Fe(NO3)3 is a strong electrolyte, it completely dissociates into its ions, resulting in a solution with a high concentration of Fe3+ ions. The Fe3+ ions will react with water, forming Fe(H2O)5(OH)+ ions and H3O+ ions. The concentration of H3O+ ions can be used to calculate the pH of the solution.