2. During high-frequency titration of 20.0 ml of BaCl2 solution with a solution of 0.2000 M (1/2H2SO4), the following data were obtained on the instrument scale:
V(H2SO4), ml 2.0 4.0 6.0 8.0 10.0
Instrument readings
68.3 50.5 34.5 28.0 21.5
Construct a titration curve and determine the BaCl2 content in grams in the test solution (option 1), the molar concentration of BaCl2 (option 2), and the concentration of BaCl, g/l (option 3).

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