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2. (8 points) Citric acid (CH,O(COOH)3) is a triprotic acid with Ka values of 7.44x 10-, 1.73 × 10-5 and 4.02 × 10-7. For a 0.15 M solution of citric acid at pH 6.4, what are the predominant species? O C3H O(COOH)3 and C,H, O(COOH) COO 0 C,H50(COOH)2C00 ○ C3H50(COOH)2C00-and C3H,OC00H (COO-)2 。C3HsOCOOH(COO-)2 and C3H50(COO-)s
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