3. The drug "Betacid" is easily hydrolyzed with the release of free hydrochloric acid. When analyzing the drug, the concentration of the acid is determined by conductometric titration. When titrating 50 ml of the drug solution with a 0.5 N KOH solution, the following data were obtained:
volume of KOH, ml 3.0 6.4 9.0 17.0 20.5 25.0
X*102, Sm*m-1 3.65 2.75 2.05 1.70 2.55 3.65
Determine the concentration of hydrochloric acid in mol*l-1.

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