1. Calculate the H3O⁺ ion concentration in an aqueous solution with a pH of 2.25 at 25°C. 2. In a 0.3395 M solution of weak acid (HA), the pH is 2.37 at 25°C. Calculate pKa for HA at this temperature.
3. The Ka for the weak acid HA is 5.63 × 10^–6. Calculate the Kb for conjugate base A⁻ at 25°C.
4. If the H3O⁺ ion concentration in an aqueous solution at 25 °C is measured as 3.01 x 10^–9 M, what is the pH of the solution?
5. What is the pH of a 0.0979 M HNO3 solution?
6. If the H3O⁺ ion concentration in an aqueous solution at 25 °C has a value of 3.38 x 10^–10 M, what is the pOH of the solution?