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O : : O : O : C C : O : H : : : Thomas Edison State University General Chemistry II with Labs (CHE-122) Section no.: Semester and year: Spring 2019 Written Assignment 7: Lewis Acids and Bases Answer all assigned questions and problems, and show all work. 1. Oxalic acid (C 2 H 2 O 4 ) has the following structure: An oxalic acid solution contains the following species in varying concentrations: C 2 H 2 O 4 , C 2 HO 4 , C 2 O 4 2– , and H + . a. Draw Lewis structures of C 2 HO 4 and C 2 O 4 2– . (5 points) C 2 HO 4 -
O : : O : O : C C : O : : : : : C 2 O 4 2- b. Which of the above four species can act only as acids, which can act only as bases, and which can act as both acids and bases? (5 points) (Reference: Chang 15.7)

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