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15.1 Exercise 59

Avg difficulty 2.5

The carbonate ion concentration is gradually increased in a solution containing equal concentrations of the divalent cations of magnesium, calcium, strontium, barium, and manganese. Which of the following carbonates will precipitate first? Which will precipitate last? Explain.

(a) MgCO3 •3H2OKsp=1×10−5\text{MgCO}_{3} \cdot 3 \text{H}_{2} \text{O} K_{\text{sp}} = 1 \times 1 0^{- 5}

(b) CaCO3Ksp=8.7×10−9\text{CaCO}_{3} K_{\text{sp}} = 8.7 \times 1 0^{- 9}

(c) SrCO3Ksp=7×10−10\text{SrCO}_{3} K_{\text{sp}} = 7 \times 1 0^{- 10}

(d) BaCO3Ksp=1.6×10−9\text{BaCO}_{3} K_{\text{sp}} = 1.6 \times 1 0^{- 9}

(e) MnCO3Ksp=8.8×10−11\text{MnCO}_{3} K_{\text{sp}} = 8.8 \times 1 0^{- 11}

OpenStax Chemistry 2e, 15.1 Precipitation and Dissolution, exercise 59

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Adapted from General Chemistry © 2019 Rice University. Licensed under CC BY 4.0. Sources: Chemistry 2e, Chemistry: Atoms First 2e. Imported at revision 32c7196.