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Compare solutions 2 and 4. How does the common-ion effect influence the pH of solution 4? Please explain fully, and calculate the expected pH of each of these solutions.
1) 5 mL 0.10 M HC2H3O2 + 5 mL H2O
2) 5 mL 0.10 M HC2H3O2 + 5 mL 0.10 M HCl
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