A solution of Ca 2+ is added to a solution of SO4 2- and CO3 2- , what will precipitate first , CaCO3 or CaSO4?

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A solution of Ca 2+ is added to a solution of SO4 2- and CO3 2- , what will precipitate first , CaCO3 or CaSO4?

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Answer 1 · 2018-02-08T18:58:31

Unknown in this scenario....

Explanation:

We do not know the concentration of calcium ion; nor do we know the concentrations of sulfate or carbonate ion. We do not know the solubility products of $C a S O_{4}$ $CaSO_4$ and $C a C O_{3}$ $CaCO_3$ ... but these we can look up...

$C a S O_{4} (s) ⇌ C a^{2 +} + S O_{4}^{2 -}$ $CaSO_4(s) rightleftharpoonsCa^(2+) + SO_4^(2-)$ $K_{sp} = 4.93 \times 10^{- 5}$ $K_"sp"=4.93xx10^-5$

$C a C O_{3} (s) ⇌ C a^{2 +} + C O_{3}^{2 -}$ $CaCO_3(s) rightleftharpoonsCa^(2+) + CO_3^(2-)$ $K_{sp} = 3.3 \times 10^{- 9}$ $K_"sp"=3.3xx10^-9$

On these data, calcium carbonate is more insoluble than is calcium sulfate....and so the carbonate will precipitate first given equal concentrations of anions....

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A solution of Ca 2+ is added to a solution of SO4 2- and CO3 2- , what will precipitate first , CaCO3 or CaSO4?

1 Answer

Explanation:

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