Suppose that 0.122 g of phosphorous acid, H₃PO₃, is dissolved in water and that the total volume of the solution is 50.0 mL.

(a) Estimate the pH of this solution.

(b) Estimate the pH of the solution that results when 5.00 mL of 0.175 m NaOH(aq) is added to the phosphorous acid solution.

(c) Estimate the pH of the solution if an additional 5.00 mL of 0.175 m NaOH(aq) is added to the solution in part (b).