Applying Concepts
These questions test conceptual learning.
In a second experiment with the benzoic acid in Question 137, a tiny quantity of water that contains the isotope 18O is added to the solution of benzoic acid in water. When some of the solid benzoic acid is analyzed, no 18O is found in the benzoic acid. Compare this situation with the experiment involving deuterium, and explain how the results of the two experiments can differ as they do.
Question 137
A solid sample of benzoic acid, a carboxylic acid, is in equilibrium with an aqueous solution of benzoic acid. A tiny quantity of D2O, water containing the isotope 2H, deuterium, is added to the solution. The solution is allowed to stand at constant temperature for several hours, after which some of the solid benzoic acid is removed and analyzed. The benzoic acid is found to contain a tiny quantity of deuterium, D, and the formula of the deuteriumcontaining molecules is C6H5COOD. Explain how this can happen.
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