Na2CrO4 + H2SeO4 → Na2SeO4 + H2CrO4
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The reaction of sodium chromate and selenic acid yields sodium selenate and chromic acid (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of sodium chromate and selenic acid
General equation
- Salt of weak acidBrønsted base + Strong acidBrønsted acid ⟶ Salt of strong acidConjugate base + Weak acidConjugate acid
Oxidation state of each atom
- Reaction of sodium chromate and selenic acid
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2CrO4 | Sodium chromate | 1 | Brønsted base | Salt of weak acid |
| H2SeO4 | Selenic acid | 1 | Brønsted acid | Strong acid |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Na2SeO4 | Sodium selenate | 1 | Conjugate base | Salt of strong acid |
| H2CrO4 | Chromic acid | 1 | Conjugate acid | Weak acid |
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 |
|---|---|---|---|---|
| Na2CrO4 (cr) | -1342.2[1] | -1234.93[1] | 176.61[1] | 142.13[1] |
| Na2CrO4 (ai) | -1361.39[1] | -1251.58[1] | 168.2[1] | – |
| Na2CrO4 (cr) 4 hydrate | -2528.8[1] | – | – | – |
| Na2CrO4 (cr) 10 hydrate | -4281.1[1] | – | – | – |
| H2SeO4 (cr) | -530.1[1] | – | – | – |
| H2SeO4 (cr) 1 hydrate | -840.6[1] | – | – | – |
| H2SeO4 (l) 1 hydrate | -820.5[1] | – | – | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (l):Liquid
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 |
|---|---|---|---|---|
| Na2SeO4 (cr) | -1069.0[1] | – | – | – |
| Na2SeO4 (ai) | -1079.5[1] | -965.2[1] | 172.0[1] | – |
| Na2SeO4 (cr) 10 hydrate | -4006.6[1] | – | – | – |
| H2CrO4 | – | – | – | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution
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)
- ^ ΔfH°, -1342.2 kJ · mol−1
- ^ ΔfG°, -1234.93 kJ · mol−1
- ^ S°, 176.61 J · K−1 · mol−1
- ^ Cp°, 142.13 J · K−1 · mol−1
- ^ ΔfH°, -1361.39 kJ · mol−1
- ^ ΔfG°, -1251.58 kJ · mol−1
- ^ S°, 168.2 J · K−1 · mol−1
- ^ ΔfH°, -2528.8 kJ · mol−1
- ^ ΔfH°, -4281.1 kJ · mol−1
- ^ ΔfH°, -530.1 kJ · mol−1
- ^ ΔfH°, -840.6 kJ · mol−1
- ^ ΔfH°, -820.5 kJ · mol−1
- ^ ΔfH°, -1069.0 kJ · mol−1
- ^ ΔfH°, -1079.5 kJ · mol−1
- ^ ΔfG°, -965.2 kJ · mol−1
- ^ S°, 172.0 J · K−1 · mol−1
- ^ ΔfH°, -4006.6 kJ · mol−1