A Solubility of CaCO3 The solubility product of CaCO3 is 87

A) (Solubility of CaCO3). The solubility product of CaCO3 is 8.7 x 10^-9. if the ocean on average has a [Ca^+2] = 10.5 mM, calculate the [CO3 ^-2] assuming no contribution from the atmospheric CO2?

B) If the atmosphere contributes significant amounts of CO2, for example 50 x 10^-3 mM, then what happens to CaCO3 deposition on Coral Reef?

(Please show all work its very important)

Solution

Ksp = [Ca^+2][CO3 ^-2] =8.7 x 10^-9.

[Ca^+2] = 10.5 * 10 ^-3M

=>[CO3 ^-2] = Ksp / [Ca^+2]

= 8.3 x 10^-7 M.

B)[CO3 ^-2] = 50 x 10^-6 M

=>Q =[Ca^+2][CO3 ^-2]=5.25 x 10^-7 > Ksp.

Thus , CaCo3 increases.