When the neutralization of CaCO3 +2HCL = CaCl +H2O +CO3 is produced

When the neutralization of CaCO3 +2HCL = CaCl +H2O +CO3 is produced, what is the pH reading at the endpoint in this neutralization reaction?

Expert Solution

CaCO₃ (aq) + 2HCl(aq) ==> CaCl₂(aq) + H₂O(l) + CO₂(g)

what is the pH reading at the endpoint in this neutralization reaction?

Answer: It depends on two scenarios

Case-1. CO₂ gas completely escaped from solution ==> pH = 7.0, because H₂O is neutral and CaCl₂ is also a neutral salt (Its an ionic salt and completely hydrolyzes and considered as a salt formed by strong base Ca(OH)₂ & strong acid HCl.

Case-2. If CO₂ is not completely evacuated and dissolved in water ==> pH < 7, because it forms weak acid carbonic acid as follows and is a principle buffer in our human body.

CO₂(g) + H₂O(l) <==> H₂CO₃(aq)

H₂CO₃(aq) + H₂O(l) <==> HCO₃^-(aq) + H₃O⁺(aq)

queen_honey_blossom answered 2 years ago

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