What is Sodium Hypochlorite?
Sodium hypochlorite (NaOCl), commonly known as bleach, is one of the most widely used disinfectants in healthcare facilities, clinical laboratories, hospitals, and public health settings. It is highly effective against a broad range of microorganisms, including bacteria, viruses, fungi, and many spores, making it an essential disinfectant for infection prevention and control.
When dissolved in water, sodium hypochlorite releases hypochlorous acid (HOCl), the active disinfecting agent. Hypochlorous acid penetrates microorganisms and destroys them by:
- Damaging the cell wall and membrane.
- Denaturing proteins and essential enzymes.
- Oxidizing nucleic acids (DNA and RNA), preventing microorganisms from multiplying.
- Inactivating viruses by disrupting their protein coat and genetic material.
Because of this strong oxidizing action, sodium hypochlorite rapidly kills most disease-causing microorganisms when used at the correct concentration and contact time.
Sodium Hypochlorite Solution Dilution Calculator
Prepare a working sodium hypochlorite solution for laboratory disinfection — calculate exact volumes from any commercially available stock concentration.
Sodium hypochlorite solution — enter preparation parameters
V₁ = (C₂ × V₂) ÷ C₁
→ Volume of stock sodium hypochlorite solution needed = (Target% × Total vol) ÷ Stock%
This calculator uses the standard laboratory dilution equation:
C₁ × V₁ = C₂ × V₂
Where:
C₁ = Concentration of the stock (original) sodium hypochlorite solution
V₁ = Volume of stock solution required
C₂ = Desired (final) concentration
V₂ = Final volume of the prepared solution
The calculator automatically rearranges the formula to determine the volume of stock solution needed:
V₁ = (C₂ × V₂) ÷ C₁
The remaining volume is made up with clean water:
Water Required = V₂ − V₁
This ensures accurate preparation of sodium hypochlorite solutions for routine laboratory, hospital, and healthcare disinfection.
How to Use the Calculator ?
Step 1 : Choose the concentration of the sodium hypochlorite solution available to you (e.g., 3.5%, 5%, 5.25%, 6%, 10%, or 12%).
Step 2: Enter the Desired Final Concentration
Step 3: Specify the total volume of disinfectant solution you want to prepare.
Step 4: Click “Calculate.” button , also use Reset button to recalculate .
Safety Precautions
- Wear gloves and eye protection while preparing bleach solutions.
Prepare fresh solutions daily or according to your laboratory or institutional policy. - Never mix sodium hypochlorite with acids, ammonia, alcohol, or other cleaning agents, as this can release toxic gases.
- Store the prepared solution in a clean, opaque container away from direct sunlight and heat.
- Ensure good ventilation during preparation and use.
- Keep out of reach of children.
