Potassium Acetate: Definition, Structure, Properties and Applications

Potassium Acetate is the potassium salt of acetic acid. The formula of potassium acetate is CH₃CO₂K. When the potassium base like potassium carbonate or potassium hydroxide reacts with acetic acid, it will result in the formation of potassium acetate.

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What is potassium acetate?

Following is the information regarding History of Potassium Acetate:

• Initially, acetic acid of potassium salt was used to prepare Cadet’s fuming liquid which was the first-ever organometallic compound produced.
• The compound was used as a urinary alkaliser and diuretic.
• It functions by changing the physical properties of body fluid.

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Structure of Potassium Acetate

Structure of Potassium Acetate is as follows:

• As clear from the formula, potassium acetate is formed by one acetate anion CH₃COO^- and one potassium cation K⁺.
• Both of these ions are bonded by ionic bonds.
• But the elements of anion acetate are bonded by covalent bonds and both the O₂ have resonance stabilization amongst themselves.

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Physical Properties of Potassium Acetate

Following are the Physical Properties of Potassium Acetate:

• Potassium acetate (CH₃CO₂K) deliquescent white crystalline solid
• Chemical or Molecular Formula – CH₃CO₂K.
• It appears as a deliquescent white crystalline solid
• The molecular weight of CH₃CO₂K – 98.142 g/mol.
• The density of CH₃CO₂K- 1.8 g/cm³.
• The melting point of CH₃CO₂K – 292^oC.
• CH₃CO₂K has a higher boiling point and decomposes at a higher temperature.

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Chemical Properties of Potassium Acetate

Following are the Chemical Properties of Potassium Acetate:

• Potassium acetate is also called acetic acid and potassium salt is a deliquescent white crystalline solid, it is soluble in water, ammonia, and alcohol but it is insoluble in organic solvents like ether.
• Pure potassium acetate is odourless but has a faint smell, it has a saline taste, and it will melt at 292^oC.
• If someone has diabetic ketoacidosis then the potassium level in the blood decreases, so the anion acetate present in potassium salt can be used to increase the level of potassium salt to normal with the help of the process of replacement in the neutralization of metabolites.
• In manufacturing crystal glasses and medicines CH₃CO₂K is used as dehydrating and analytical agent.

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Preparation of Potassium Acetate

Following is the information regarding Preparation of Potassium Acetate:

• To prepare potassium acetate CH₃CO₂K potassium having bases like potassium carbonate K₂CO₃ or potassium hydroxide KOH must be treated with the acetic acid.
• It is prepared by the acid-base neutralization reaction.
• In any neutralization reaction, a base is reacted with an acid to form salt and water.

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Reaction:

CH₃COOH + KOH → CH₃COOK + H₂O

Potassium Acetate can also be formed when a small volume of water is added along with potassium carbonate in the acetic acid solution then it crystallizes and evaporates.

Reaction:

K₂CO₃ + 2CH₃COOH → 2CH₃COOK + H₂O

At around the temperature range of 41.3 °C, the sesquihydrate in the water solution starts forming semi hydrates.

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Applications of Potassium Acetate

Following are the Applications of Potassium Acetate:

• CH₃CO₂K is used in fire extinguishers, in oil fire, it cools the surface and forms a coating over the oil to extinguish the fire.
• CH₃CO₂K is used in agricultural chemicals (non-pesticides).
• CH₃CO₂K is used as anti-freeze and De-icing products.
• CH₃CO₂K is used in flame retardants.
• CH₃CO₂K is used in processing aids, specific to petroleum.
• CH₃CO₂K is used as laboratory chemicals.
• CH₃CO₂K is used as plating agents and surface treating agents.
• CH₃CO₂K is used as a food preservative, food additive, and acidity regulator.
• CH₃CO₂K is used in making lubricants.
• CH₃CO₂K is used for ethanol precipitation of DNA.
• CH₃CO₂K is used as a catalyst in the production of polyurethanes.

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Points to Remember

Following are some important points:

• Potassium Acetate is the potassium salt of acetic acid.
• CH₃CO₂K is also known as diuretic salt or potassium ethanoate.
• The formula of potassium acetate is CH₃CO₂K.
• When the potassium base like potassium carbonate or potassium hydroxide reacts with acetic acid, it will result in the formation of potassium acetate.
• CH₃CO₂K usually plays an essential micromineral role in several physiological functions and normal renal function as well as blood pressure.
• CH₃CO₂K is also required in nucleic acid synthesis, cardiac skeletal muscle contractions, and nerve conduction.
• CH₃CO₂K contains an equal number of acetate and potassium ions.
• CH₃CO₂K is a white crystalline powder.
• CH₃CO₂K is soluble in water (H₂O).
• The pH value of Potassium acetate is between 7.5- 9.0.

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