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Final answer:To ascertain the pH during the titration of HC4H7O2 with Sr(OH)2, a BCA table to account for the titrant and analyte amounts and an ICE table to calculate equilibrium concentrations and pH, based on the weak acid or its conjugate base, are utilized.Explanation:To determine the pH at a particular point during the titration of HC4H7O2 (a weak acid) with Sr(OH)2 (a strong base), we use a BCA table and an ICE table. The BCA table (Before, Change, After) tracks the amounts of acid and base before the titration, the amount used during the titration, and the amounts after the titration respectively. Using the remaining concentration of the weak acid or the produced conjugate base, we can then set up an ICE table (Initial, Change, Equilibrium) to calculate the pH by finding the concentrations of H+ or OH− at equilibrium.Depending on the stage of the titration, you'll consider the dissociation of the weak acid before the equivalence point or the hydrolysis of the conjugate base after the equivalence point. If you are at the half-equivalence point, you can directly use the pKa value as the pH. At the equivalence point, you would consider the pH of the salt formed in the reaction....