Consider the titration of a 50 mL sample of 0.180 M HF with 0.210 M NaOH. Determine each quantity. The Ka for hydrofluoric acid is 3.5 x 10⁻4. Calculate the volume of added base that is required to reach the equivalence point. (Hint: what equals what at the equivalence point?) The initial pH of HF Calculate the pH after adding 5.0 mL of NaOH. (Hint: What kind of solution have you made? What equation can you use to calculate the pH?) The pH at one-half of the equivalence point. (Hint: what equals what at one-half the equivalence point?) The pH at the equivalence point The pH after adding 50 mL of NaOH Graph the titration curve. Include labels for equivalence point, pKa, buffer region, and where there is excess OH⁻.