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Calcium ions are neutral and hydrogencarbonate ions are: (!!) BOTH acid AND base at the same time, both very weakly, though it is a bit more base than acidic:

  • acid: HCO3- + H2O --> CO32- + H3O+ pKa=10.25
  • base: HCO3- + H2O -->H2CO3 + OH- pKb= 7.64
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