4KOH + Na₂Cr₂O₇ 💧→ 2K₂CrO₄↓ + 2NaOH + H₂O

Last updated: June 13, 2022

Reaction of potassium hydroxide and sodium dichromate: 4KOHPotassium hydroxide + Na₂Cr₂O₇Sodium dichromate
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2K₂CrO₄↓Potassium chromate + 2NaOHSodium hydroxide + H₂OWater

The reaction of potassium hydroxide and sodium dichromate yields potassium chromate, sodium hydroxide, and water. 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
KOH	Potassium hydroxide	4	Lewis acid	Very soluble in water
Na₂Cr₂O₇	Sodium dichromate	1	Lewis base	Very soluble in water

Chemical formula	Name	Coefficient	Type	Type in general equation
K₂CrO₄	Potassium chromate	2	Lewis conjugate	Insoluble in water
NaOH	Sodium hydroxide	2	Non-redox product	–
H₂O	Water	1	Non-redox product	–

Reaction of potassium hydroxide and sodium dichromate: 4KOHCrystalline solid + Na₂Cr₂O₇Crystalline solid
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2K₂CrO₄↓Crystalline solid + 2NaOHCrystalline solid + H₂OLiquid

	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	−266.8	–	–	–
per 1 mol of Potassium hydroxide	−66.70	–	–	–
per 1 mol of Sodium dichromate	−266.8	–	–	–
per 1 mol of Potassium chromate	−133.4	–	–	–
per 1 mol of Sodium hydroxide	−133.4	–	–	–
per 1 mol of Water	−266.8	–	–	–

Reaction of potassium hydroxide and sodium dichromate ◆ Δ_rG −77.1 kJ/mol K 3.22 × 10¹³ pK −13.51: 4KOHIonized aqueous solution + Na₂Cr₂O₇Ionized aqueous solution
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2K₂CrO₄↓Ionized aqueous solution + 2NaOHIonized aqueous solution + H₂OLiquid

	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	−97.7	−77.1	−69.8	–
per 1 mol of Potassium hydroxide	−24.4	−19.3	−17.4	–
per 1 mol of Sodium dichromate	−97.7	−77.1	−69.8	–
per 1 mol of Potassium chromate	−48.9	−38.5	−34.9	–
per 1 mol of Sodium hydroxide	−48.9	−38.5	−34.9	–
per 1 mol of Water	−97.7	−77.1	−69.8	–

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
KOH (cr)	-424.764^[1]	-379.08^[1]	78.9^[1]	64.9^[1]
KOH (g)	-231.0^[1]	-232.6^[1]	238.3^[1]	49.20^[1]
KOH (ai)	-482.37^[1]	-440.50^[1]	91.6^[1]	-126.8^[1]
KOH (cr) 1 hydrate	-748.9^[1]	-645.1^[1]	117.2^[1]	–
KOH (cr) 2 hydrate	-1051.0^[1]	-887.3^[1]	150.6^[1]	–
Na₂Cr₂O₇ (cr)	-1978.6^[1]	–	–	–
Na₂Cr₂O₇ (ai)	-1970.7^[1]	-1824.9^[1]	379.9^[1]	–
Na₂Cr₂O₇ (cr) 2 hydrate	-2574.8^[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
K₂CrO₄ (cr)	-1403.7^[1]	-1295.7^[1]	200.12^[1]	145.98^[1]
K₂CrO₄ (ai)	-1385.91^[1]	-1294.30^[1]	255.2^[1]	–
NaOH (cr)	-425.609^[1]	-379.494^[1]	64.455^[1]	59.54^[1]
NaOH (g)	-207.1^[1]	-210.0^[1]	228.43^[1]	48.37^[1]
NaOH (ai)	-470.114^[1]	-419.150^[1]	48.1^[1]	-102.1^[1]
NaOH (cr) 1 hydrate	-734.543^[1]	-629.338^[1]	99.50^[1]	90.17^[1]
NaOH (l) 2 hydrate	-1019.076^[1]	-873.091^[1]	195.979^[1]	239.41^[1]
NaOH (l) 3.5 hydrate	-1459.798^[1]	-1236.356^[1]	286.089^[1]	354.43^[1]
NaOH (l) 4 hydrate	-1605.15^[1]	-1356.64^[1]	318.70^[1]	–
NaOH (l) 5 hydrate	-1894.31^[1]	-1596.34^[1]	386.06^[1]	–
NaOH (l) 7 hydrate	-2469.02^[1]	-2073.80^[1]	526.31^[1]	–
H₂O (cr)	–	–	–	–
H₂O (l)	-285.830^[1]	-237.129^[1]	69.91^[1]	75.291^[1]
H₂O (g)	-241.818^[1]	-228.572^[1]	188.825^[1]	33.577^[1]

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