Ca(HCO3)2 + 2e− → CaOH+ + C2O42− + OH−
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- Reduction of calcium hydrogencarbonate
- Ca(HCO3)2Calcium hydrogencarbonate + 2e−ElectronCaOH+Calcium hydroxide ion + C2O42−Oxalate ion + OH−Hydroxide ion⟶
Reduction of calcium hydrogencarbonate yields calcium hydroxide ion, oxalate ion, and hydroxide ion (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reduction of calcium hydrogencarbonate
- Ca(HCO3)2Calcium hydrogencarbonate + 2e−ElectronCaOH+Calcium hydroxide ion + C2O42−Oxalate ion + OH−Hydroxide ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of calcium hydrogencarbonate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Ca(HCO3)2 | Calcium hydrogencarbonate | 1 | Oxidizing | – |
| e− | Electron | 2 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CaOH+ | Calcium hydroxide ion | 1 | – | – |
| C2O42− | Oxalate ion | 1 | Reduced | – |
| OH− | Hydroxide ion | 1 | – | – |
Thermodynamic changes
Thermodynamic data of reactants
| Chemical formula | Standard enthalpy of formation ΔfH° kJ · mol−1 | Standard Gibbs energy of formation ΔfG° kJ · mol−1 | Standard molar entropy S° J · K−1 · mol−1 | Standard molar heat capacity at constant pressure Cp° J · K−1 · mol−1 |
|---|---|---|---|---|
| Ca(HCO3)2 | – | – | – | – |
| e− | – | – | – | – |
Thermodynamic data of products
| Chemical formula | Standard enthalpy of formation ΔfH° kJ · mol−1 | Standard Gibbs energy of formation ΔfG° kJ · mol−1 | Standard molar entropy S° J · K−1 · mol−1 | Standard molar heat capacity at constant pressure Cp° J · K−1 · mol−1 |
|---|---|---|---|---|
| CaOH+ (ao) | – | -718.4[1] | – | – |
| C2O42− (ao) | -825.1[1] | -673.9[1] | 45.6[1] | – |
| OH− (g) | -143.5[1] | – | – | – |
| OH− (ao) | -229.994[1] | -157.244[1] | -10.75[1] | -148.5[1] |
* (ao):Un-ionized aqueous solution, (g):Gas
References
List of references
- 1Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)