(Answered) When the activity of na in an estuary is evaluated using

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When the activity of Na⁺ in an estuary is evaluated using the conventional standard state conditions (molar concentration of 1.0, chemical environment corresponding to infinite dilution in pure water), α_Na⁺ is estimated to be 0.015. Would this value increase, decrease, or remain the same if the reference state environment is changed to seawater? Explain your reasoning.

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