When chlorine dissolves in water, a chemical reaction occurs, leading to the formation of HClO—commonly recognized as hypochlorous acid, a potent yet weak acid.
The dynamic equilibria established during the formation of hypochlorous acid plays a critical role in the efficiency of its disinfecting capabilities.
In this article we will dive into the properties of this amazing chemical making waves in the skincare and cleaning industry as of late 2024.
You’ll be equipped with a thorough understanding of its properties and formation.
Already aware of Hypochlorous acid and its wonderful uses? You can buy it in bulk in the UAE or visit our shop to buy hocl products for your home.
Key Takeaways
🎯 Optimal pH for Effectiveness
Hypochlorous acid (HOCl) is most effective as a disinfectant at a pH range of 5-7, where it remains stable and outperforms other chlorine species.
🎯 Superior Disinfection
HOCl’s neutral charge enables it to penetrate pathogen membranes more effectively than hypochlorite ions, ensuring powerful antimicrobial action.
🎯 Eco-Friendly Properties
Biodegradable and non-toxic, HOCl is a safer, environmentally friendly alternative to bleach and minimizes indoor air pollution.
🎯 Advanced Production Methods
Single-cell electrolysis produces a more stable and effective form of HOCl compared to older membrane cell methods, enhancing its usability.
🎯 Versatility and Applications
From disinfecting water to combating pathogens during the COVID-19 pandemic, HOCl is celebrated for its exceptional antimicrobial properties.
🎯 Enzymatic Production in the Body
White blood cells naturally produce HOCl using myeloperoxidase to neutralize pathogens, highlighting its role in immune defense.
🎯 Chemical Insights
HOCl has the formula HClO and a bent molecular structure, contributing to its strong oxidizing and disinfecting capabilities.
How do White Blood Cells make Hypochlorous Acid?
White blood cells, specifically neutrophils, play a crucial role in the body’s defense against pathogens. One of their mechanisms in fighting off infections is the production of hypochlorous acid (HOCl). This powerful antimicrobial substance is synthesized within white blood cells through a series of enzymatic reactions.
The Role of Enzymes in Hypochlorous Synthesis
The enzyme responsible for facilitating the synthesis of hypochlorous acid in white blood cells is called myeloperoxidase (MPO). MPO is found abundantly in immune cells, particularly neutrophils, and is an essential component of the innate immune system.
When white blood cells encounter pathogens, they engulf and encapsulate them in an organelle called a phagosome. Inside the phagosome, MPO is activated and catalyzes the reaction between hydrogen peroxide (H2O2) and chloride ions (Cl–) to form hypochlorous acid (HOCl).
This enzymatic reaction can be summarized as follows:
H2O2 + Cl– → HOCl + H2O
The production of hypochlorous acid by MPO is a fundamental defense mechanism of white blood cells. It allows them to effectively neutralize and destroy bacteria, viruses, and other harmful microorganisms.
Understanding Hypochlorous Acid Production
We have long embraced the necessity for maintaining a safe supply of water and the importance of water disinfection methods. One of the most effective means to achieve this is through the chlorination of water.
This involves adding chlorine to water to form disinfection byproducts, primarily hypochlorous acid (HClO) and, to a lesser extent, hydrochloric acid (HCl).
The electrolysis of sodium chloride is a cornerstone of industrial chemistry, enabling the large-scale production of chlorine gas.
When a brine solution—commonly a mixture of sodium chloride (NaCl) and water (H2O)—undergoes electrolysis, chlorine gas is liberated at the anode. Upon its formation, this chlorine gas can be brought into contact with water, instigating hypochlorous acid reactions.
This is an older method known as membrane cell technology which produces a far more acidic and unstable form of HOCL but thanks to the latest advancements in technology, we can now produce hypochlorous acid at an astable pH level of 5-7 through an electrolysis method called single-cell technology, more on this later…
It’s pivotal to recognize that the specific chemistry of chlorine in water will depend heavily on the water’s pH level. Notably, at a pH range of 5 to 6, hypochlorous acid is the predominant chlorine species.
As an oxidizing agent, the role of oxidation with chlorine is significant, because it is capable of rapidly destroying a wide range of harmful microorganisms by penetrating the cell walls and reacting with cellular components.
Did you know ? HOCl is 80-100 times stronger than your common household bleach (Sodium hypochlorite)?
How is HOCl produced by Electrolysis?
There are two methods to carry out Electrolysis for the formation of HOCL:
- Membrane Cell
- Single Cell
Membrane Cell Electrolysis
In membrane cell electrolysis, the cell consists of two compartments: an anode compartment and a cathode compartment, which are separated by a membrane.
This membrane is made from a polymer that only allows positive ions to pass through to the cathode compartment. Over at the anode compartment, a sodium chloride solution is injected.
The positively charged sodium ions pass through the membrane to the cathode side, while the negatively charged chloride ions are unable to pass through.
As a result, two solutions are generated: an anolyte and a catholyte. In the anode compartment, a solution of hypochlorous acid (HOCL) is produced.
This solution is strongly acidic and has an ORP (oxidation-reduction potential) greater than 800 mV. On the other hand, in the cathode compartment, a solution of NaOH is generated.
This solution is strongly alkaline and has an ORP lower than -800. However, it’s important to note that neither of these solutions is stable. Both the anolyte and catholyte are constantly seeking to return to an equilibrium state, and as a result, they rapidly lose their ORP.
Single Cell Electrolysis
Single-cell electrolysis produces a single solution called an anolyte, which consists of hypochlorous acid. In single-cell electrolysis, there is a single compartment that contains the electrolysis cells with both the anode and cathode.
These cells are specifically engineered to generate a solution with an oxidation-reduction potential (ORP) greater than 800. By using an acidified brine, a neutral to acidic free chlorine solution is created, with hypochlorous acid being the dominant component.
The benefit? HOCl remains stable unless it comes into contact with an organic surface or encounters oxygen in the air.
Unlike membrane cell electrolysis, single-cell technology does not separate the saltwater into two streams with different oxidation-reduction potentials and pH levels. Which leads to the generation of a more stable solution that does not strive to regain equilibrium.
Single-cell systems exclusively produce an anolyte solution, which falls within the pH range of 5 to 7. This particular pH range is ideal for hypochlorous acid in terms of both stability and effectiveness as a disinfectant or cleaner.
Did you know that hypochlorous acid is an eco-friendly & safer alternative to conventional bleach for combatting Covid-19?
pH Influence on Hypochlorous Acid Stability
The stability of hypochlorous acid is highly influenced by pH. Hypochlorous acid is most stable at a pH range between 5.5 and 7.5.
At lower pH values, the acid dissociates into hypochlorite ions, which results in a decrease in its effectiveness as a disinfectant. While at higher pH values, hypochlorous acid undergoes rapid decomposition, leading to a loss of its disinfection properties.
It is important to maintain the appropriate pH range to ensure the stability of HOCl during its production and utilization in laboratory applications.
It’s also critically important to know how to properly store your hypochlorous acid otherwise you risk loosing its effectiveness and reducing its shelf life.
What is the Chemical Formula for Hypochlorous Acid?
The chemical formula HClO represents hypochlorous acid, It consists of one hydrogen atom (H), one chlorine atom (Cl), and one oxygen atom (O). It has a molar mass of 52.46 g/mol.
This relatively lightweight molecule proves pivotal in the large-scale production of disinfectants that are both effective and safe for use in a multitude of settings.
What is the Structure of a Hypochlorous Acid Molecule?
The structure of a hypochlorous acid molecule is bent in shape. It has a hydrogen atom at one end, a chlorine atom in the middle, and an oxygen atom at the other end.
This molecular structure contributes to the reactivity and properties of hypochlorous acid, allowing it to function as a powerful oxidizing agent and disinfectant.
What is the Function of Hypochlorous Acid?
Hypochlorous acid (HOCl) has a wide range of functions and uses, making it a versatile compound with significant applications.
We encourage you to check out our articles below to learn more about this amazing chemical compound.
Conclusion & Frequently Asked Questions.
Conclusion
References & Sources
Frequently Asked Questions
Hypochlorous acid was discovered by the French chemist Antoine Jérôme Balard in 1834. It was recognized for its powerful bleaching and antimicrobial properties.
Hypochlorous acid acts as a potent oxidizer and disinfectant, capable of destroying a wide range of pathogens including bacteria, viruses, and fungi. It is particularly effective against the coronavirus responsible for COVID-19. As such, it has a significant role in promoting public health by maintaining sanitary conditions in various environments.
Hypochlorous acid has the chemical formula HClO and a molar mass of 52.46 g/mol. It is a weak acid with a pKa of 7.53, meaning it partially dissociates in water. Hypochlorous acid is soluble in water and typically presents as a colorless aqueous solution.
The pH level dictates the balance between hypochlorous acid (HClO) and its anion hypochlorite (ClO−) in water. Hypochlorous acid is the predominant species at a pH range of 5-6, and this is where it retains its maximum disinfecting efficiency. Outside of this pH range, the balance shifts towards the formation of hypochlorite.
Electrolysis produces hypochlorous acid by applying a direct electrical current to a solution of sodium chloride (salt brine) and water. This process generates chlorine gas and sodium hydroxide. The chlorine gas then reacts with water to form hypochlorous acid. Membrane cell or Single cell technology is often used to ensure the purity of hypochlorous acid produced.
Hypochlorous acid has a variety of uses. It is an FDA-approved wound care agent in healthcare, used for treating infections in both humans and animals. It is a popular sanitizer for swimming pools and water treatment facilities. Hypochlorous acid is also used in marine sanitation devices, converting seawater into a disinfecting solution, and serves as a reagent in organic synthesis, specifically for converting alkenes to chlorohydrins.
Sultan Alam Khan leads HOCl Hub as Editor in Chief, where he oversees product reviews and guides on cleaning solutions. Specializing in hypochlorous acid applications and green cleaning technology, he helps readers choose effective, eco-friendly disinfection products.
His expertise spans sustainable sanitization methods, chemical safety, and environmental health. At HOCl Hub, Sultan ensures all content meets strict editorial standards for accuracy and scientific backing.
