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If a Solution Is Prepared by Dissolving 1

Question 46

Multiple Choice

If a solution is prepared by dissolving 1.6 mol Na2CrO4 in 1.0 L of a buffer at pH 8.24, what will be [Cr2O72-] in the solution? The resultant equilibria are: HCrO4- ⇌ H+ + CrO42-   Ka = 3.2 × 10-7
2 HCrO4- ⇌ Cr2O72-+ H2O   K = 33


A) 9.9 × 10-5 M
B) 2.9 × 10-28 M
C) 8.9 × 10-9 M
D) 8.6 × 102 M
E) 2.8 × 10-2 M

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