What is carbonic acid equilibrium?

What is carbonic acid equilibrium?

This carbonic acid-carbonate equilibrium determines the amount of free protons in the seawater and thus the pH value. CO2 + H2O ↔ H2CO3 ↔ H+ + HCO3– ↔ 2 H+ + CO32– In summary, the reaction of carbon dioxide in seawater proceeds as follows: First the carbon dioxide reacts with water to form carbonic acid.

What is the pH of carbonic acid?

pH of Common Acids and Bases

Acid Name 10 mM
H2CO3 carbonic acid 4.18
H2CrO4 chromic acid 2.33
H2MoO4 molybdic acid 2.94
H2S hydrogen sulfide 4.47

What is the equation for carbonic acid?

Carbonic acid/Formula

What is the equilibrium of carbon dioxide?

Dissociation of Carbon Dioxide After proton transfer from water to an oxygen of the CO2 unit, carbonic acid is formed. The reaction between water and dissolved carbon dioxide is reversible and rapid. Carbonic acid is in equilibrium with the bicarbonate anion.

Is carbonic acid in equilibrium?

First Dissociation and HCO Because the dissolved carbon dioxide is in equilibrium with carbonic acid and carbonic acid is in equilibrium with bicarbonate and a proton in water, it is convenient to consider CO2(aq) to be the acid.

What is the pH of phosphoric acid?

For large acid concentrations, the solution is mainly dominated by the undissociated H3PO4. At 10-2 M, the pH is close to pKa = 2.14, giving an equimolar mixture of H3PO4 and H2PO4-….Phosphoric Acid H3PO4.

H2PO4- dihydrogen phosphate
HPO4-2 hydrogen phosphate
PO4-3 phosphate (orthophosphate)

How does carbonic acid affect pH?

Carbon dioxide reacts with seawater to form carbonic acid, which releases hydrogen ions, reducing pH.

How do you find the pH of H2CO3?


  1. Normal values: HCO3: 22-26 meq/L. PCO2: 35 – 45 mmHg. pH: 7.35 – 7.45.
  2. Quick derivation: Carbonic acid (H2CO3) equilibrium: [H+] x [HCO3-] <—> [H2CO3] <—> [CO2] x [H2O] [H+] x [HCO3-] = K x [CO2] x [H2O]
  3. Final: pH = 6.1 +log (HCO3-/ (0.03 x PCO2))

What is equilibrium of carbonic acid and carbon dioxide gas?

In non-biological solutions. The hydration equilibrium constant at 25 °C is called Kh, which in the case of carbonic acid is [H2CO3]/[CO2] ≈ 1.7×10−3 in pure water and ≈ 1.2×10−3 in seawater. Hence, the majority of the carbon dioxide is not converted into carbonic acid, remaining as CO2 molecules.

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