4. Tablets of acidin-pepsin, when introduced into the stomach, are easily hydrolyzed, releasing free hydrochloric acid. When titrating 25 cm3 of the solution obtained by hydrolysis with a 0.25 M solution of caustic potassium, the following results were obtained:
Volume 0.25 M KOH solution, cm3 3.2 6.1 9.2 15.4 20.1 23.4
κ*10-2, Ohm-1*m-1 3.28 2.55 1.85 1.64 2.40 2.96
Determine the concentration of hydrochloric acid in mol * dm-3.

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