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2. [4 Points: 1 Point Each] On the graph below, determine the: i) equivalence point, ii) pH at the equivalence point, iii) half the equivalence point, and iv) pH at half the equivalence point. Record these in the table below. You must show work (lines used to determine i-iv on the graph) to receive credit. Titration Curve of Weak Acid with NaOH 14 12 pH Volume of NaOH 10- 8 6 Equivalence point 4 Half the equivalence point 0 5 10 45 50 15 20 25 35 40 Volume NaOH Added, ml. 3) [1 Point] What is the pk, of the weak acid?, 4) [3 Points] Calculate the Ka of weak acid. Show work. Show all work to receive credit. 5) [6 Points] Calculate pH of a buffer solution containing 0.142 M HC₂H302 and 1.82 M 0.142 M NaC₂H30₂. The K₂ for the acid is 1.80 x 105. Show all work to receive credit. E