BaI₂ + Na₂S₂O₃ 💧→ BaS₂O₃↓ + 2NaI

Last updated: June 13, 2022

Reaction of barium iodide and sodium thiosulfate: BaI₂Barium iodide + Na₂S₂O₃Sodium thiosulfate
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BaS₂O₃↓Barium thiosulfate + 2NaISodium iodide

The reaction of barium iodide and sodium thiosulfate yields barium thiosulfate and sodium iodide. This reaction is an acid-base reaction and is classified as follows:

Table of contents

Reaction data

Chemical formula	Name	Coefficient	Type	Type in general equation
BaI₂	Barium iodide	1	Lewis acid	Very soluble in water
Na₂S₂O₃	Sodium thiosulfate	1	Lewis base	Very soluble in water

Chemical formula	Name	Coefficient	Type	Type in general equation
BaS₂O₃	Barium thiosulfate	1	Lewis conjugate	Slightly soluble in water
NaI	Sodium iodide	2	Non-redox product	–

Reaction of barium iodide and sodium thiosulfate: BaI₂Crystalline solid + Na₂S₂O₃Crystalline solid
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BaS₂O₃↓Crystalline solid + 2NaICrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	–	–	–
per 1 mol of Barium iodide	–	–	–	–
per 1 mol of Sodium thiosulfate	–	–	–	–
per 1 mol of Barium thiosulfate	–	–	–	–
per 1 mol of Sodium iodide	–	–	–	–

Reaction of barium iodide and sodium thiosulfate: BaI₂Ionized aqueous solution + Na₂S₂O₃Ionized aqueous solution
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BaS₂O₃↓Crystalline solid + 2NaIIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	–	–	–
per 1 mol of Barium iodide	–	–	–	–
per 1 mol of Sodium thiosulfate	–	–	–	–
per 1 mol of Barium thiosulfate	–	–	–	–
per 1 mol of Sodium iodide	–	–	–	–

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
BaI₂ (cr)	-602.1^[1]	–	–	–
BaI₂ (g)	-326^[1]	-377^[1]	343^[1]	61.5^[1]
BaI₂ (ai)	-648.02^[1]	-663.92^[1]	232.2^[1]	–
BaI₂ (cr) 1 hydrate	-919.2^[1]	–	–	–
BaI₂ (cr) 2 hydrate	-1216.7^[1]	–	–	–
BaI₂ (cr) 2.5 hydrate	-1363.6^[1]	–	–	–
BaI₂ (cr) 7 hydrate	-2676.5^[1]	–	–	–
Na₂S₂O₃ (cr)	-1123.0^[1]	-1028.0^[1]	155^[1]	–
Na₂S₂O₃ (ai)	-1132.40^[1]	-1046.0^[1]	184.1^[1]	–
Na₂S₂O₃ (cr) 5 hydrate	-2607.93^[1]	-2229.8^[1]	372^[1]	–

* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
BaS₂O₃ (cr)	–	–	–	170.3^[1]
NaI (cr)	-287.78^[1]	-286.06^[1]	98.53^[1]	52.09^[1]
NaI (g)	-79.5^[1]	-121.0^[1]	248.978^[1]	36.65^[1]
NaI (ai)	-295.31^[1]	-313.47^[1]	170.3^[1]	-95.8^[1]
NaI (cr) 1 hydrate	-883.096^[1]	-771.10^[1]	196.2^[1]	–

* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution