3. Calculate the activity coefficient of the hydrogen ion in solutions of hydrochloric acid of various condensations: a) 0.001 M b) 0.01 M c) 0.1 M d) 1.0 M. Compare them with the experimental values yH =y± (“quick reference book physical and chemical quantities, table 72). Draw a conclusion about the concentration region in which the provisions of the Debye-Hückel theory are most valid.

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