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Citric acid (H3C6H5O7) is a triprotic acid with K1 = 8.4 × 10−4, K2 = 1.8 × 10−5, and K3 = 4.0 × 10−6. In a 0.01-M aqueous solution of citric acid, which of the following species is present in the lowest concentration?

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Citric acid (H3C6H5O7) is a triprotic acid with K1 = 8.4 × 10−4, K2 = 1.8 × 10−5, and K3 = 4.0 × 10−6. In a 0.01-M aqueous solution of citric acid, which of the following species is present in the lowest concentration?






 
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