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Cave Chemistry

Cave Chemistry. What cave formation needs: 1. Make a hole in the ground 2. Partially fill it with cool formations. Cave Chemistry. CaCO 3 (s)  Ca 2+ (aq) + CO 3 2- (aq) K sp (CaCO 3 ) = 4.8 x 10 -9 Calculate solubility in mg/L: Actual solubility: 80 mg/L Why???.

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Cave Chemistry

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  1. Cave Chemistry

  2. What cave formation needs:1. Make a hole in the ground2. Partially fill it with cool formations

  3. Cave Chemistry CaCO3(s)  Ca2+(aq) + CO32-(aq) Ksp(CaCO3) = 4.8 x 10-9 Calculate solubility in mg/L: Actual solubility: 80 mg/L Why???

  4. Effect of [CO2]. What should happen as [CO2] increases? CaCO3(s)  Ca2+(aq) + CO32-(aq) CO2 + H2O  H2CO3 H2CO3 HCO3- + H+ Ka1(H2CO3) = 4.2 x 10-7 HCO3- CO32- + H+ Ka2(HCO3-) = 4.8 x 10-11

  5. CaCO3(s)  Ca2+(aq) + CO32-(aq) CO2(g) + H2O(l)  H2CO3(aq) H2CO3(aq) HCO3-(aq) + H+(aq)Ka1(H2CO3) = 4.2 x 10-7 HCO3-(aq)  CO32-(aq) + H+(aq) Ka2(HCO3-) = 4.8 x 10-11 The Key Reaction is:

  6. So: 1. Formation of the big hole

  7. So: 2. Making those formations

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