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The chief compound in marble is CaCO3. Marble has been widely used for statues and ornamental...

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Chemistry

The chief compound in marble is CaCO3. Marble has been widelyused for statues and ornamental work on buildings, including suchstructures as the Taj Mahal. However, marble is readily attacked byacids via the following reaction.

CaCO3(s)+H+(aq)⇌Ca2+(aq)+HCO3−(aq)

Equilibrium constants at 25 ∘C are listed in thetable below.

SubstanceKcValue of Kc
CaCO3Ksp4.5×10−9
H2CO3Ka14.3×10−7
Ka25.6×10−11

What is the molar solubility of marble (i.e., [Ca2+]in a saturated solution) in normal rainwater, for whichpH=4.20?

Answer & Explanation Solved by verified expert
3.9 Ratings (594 Votes)
We knwo that Ksp of CaCO3 can be represented as CaCO3 s Ca2 aq CO32 aqKsp 45 X 1091 The first dissociation of H2CO3 will    See Answer
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