Question

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8. Many marine organisms generate shells from calcium carbonate (CaCO3). A. (4 pts) Write out the balanced chemical equation that corresponds to dissociation of calcium carbonate. B. (5 pts) One of the many consequences of climate change is ocean acidification, which occurs because rising surface temperatures allow more CO2 to dissolve in the water, resulting in increased H3O* concentration in the ocean. Using a chemical reaction and a few words, explain why ocean acidification has a detrimental effect on calcium carbonate shells. C. (5 pts) A water sample contains 0.237 M Na2CO3. What is the molar solubility of CaCO3 in this sample? Ksp(CaCO3) = 3.36 x 10

Answer 1

Dissociation of CaCO3 Cacoz (s) Ca2+ (aq) + cope- (aq). Decomposition: Cacoz (3) CO (3) + CO2(g). ② H300 react with cog?- to form con gas. cograg) + 2H30 (ag) - co2(g) + 3 H20 (1) for this reaction the cacoz dissociation equilibrium shift in right direction. So More cacoz is consumed in acidic medium. cacoz Ca2+ + cop²- S (M) (5+0.237) M kSp = [Ca 2+] [Coz?- 3.36 x 10 9 = sx (s+ 0.237) As (6 <0. 237). So, (s +0.237) = 0.237 () 3.36 X10-9 = Sx0.237 S = 1.42 x 10-8 (M) Molar solubility of cacoz = 1.42 x 108 (M)