Sodium hypochlorite solution (Javen water) 8% - 12% is a type of Sodium hypochlorite containing a concentration of NaClO ranging from 8% to 12%. This chemical is primarily used for bleaching and disinfection purposes. In this article, Dong A JSC will share information about the specifications, preparation methods, applications, storage guidance, and incident handling for Javen.
Overview of Sodium hypochlorite solution 8% - 12%
Sodium hypochlorite solution (called Javen water) is a mixture of two types of salts, Sodium chloride (NaCl) and Sodium hypochlorite (NaClO). These salts are produced by reacting excess chlorine gas with a NaOH solution, specifically as follows:
Cl2 + 2NaOH → NaCl + NaClO + H2O
When Javen water is exposed to air, it reacts with carbon dioxide, forming unstable hypochlorous acid (HClO), which has very strong oxidizing properties.
Physical properties
-
Javen water is a yellow solution with a pungent chlorine-like odor, unstable, and easily decomposes when exposed to light.
-
The molar mass of Javen water is 74.44 g/mol.
-
The melting and boiling points are 18°C and 102.2°C, respectively.
-
The specific gravity and density are 1.20 and 1.11 g/ml, respectively.
Chemical properties
Javen water 8% - 12% has strong oxidizing properties and can react with protic acids such as hydrochloric acid to produce salts and chlorine gas. Additionally, it reacts with certain acids to form hypochlorous acid (HClO). In water, Javen water decomposes into Na+ and Cl- ions and can also decompose into sodium chloride and oxygen.
Reactions:
-
With oxalic acid: NaClO + H2C2O4 → NaCl + 2CO2 + H2O
-
With hydrochloric acid: NaClO + 2HCl → Cl2 + H2O + NaCl
-
With sulfuric acid: 2NaClO + H2SO4 → Na2SO4 + 2HClO
-
With hydrogen peroxide: NaClO + 2H2O2 → NaClO3 + 2H2O
-
With CO2 and water: NaClO + CO2 + H2O → HClO + NaHCO3
-
With liquid NaOH: NaClO + 2NH2Cl + 2NaOH → 3NaCl + 3H2O + N2
-
With potassium iodide: NaClO + H2O + 2KI → I2 + 2KOH + NaCl
-
With buffered PbS: PbS + 4NaClO → 4NaCl + PbSO4
-
With active metals: Zn + NaClO → ZnO + NaCl
Preparation of Javen water in the laboratory and industry
Javen water is prepared by bubbling chlorine gas into a sodium hydroxide solution to produce sodium hypochlorite (NaClO), salt (NaCl), and water.
Cl2 + 2NaOH → NaClO + NaCl + H2O
If the reaction temperature exceeds 60°C and the NaOH is concentrated, the above reaction will not produce NaClO but sodium chlorate, sodium chloride, and water.
6NaOH + 3Cl2 → 5NaClO3 + NaCl + 3H2O
Another method involves reacting manganese dioxide with hydrochloric acid to generate chlorine gas, which then reacts with NaOH solution to produce NaClO.
MnO2 + 4HCl → Cl2 + MnCl2 + 2H2O
2NaOH + Cl2 → NaClO + NaCl + H2O
Javen water is produced through the electrolysis of NaCl solution. Concentrated saltwater is subjected to electrolysis to create sodium hypochlorite in the water, with each liter containing approximately 150 g of active chlorine. The reaction also produces hydrogen gas:
2NaCl + 2H2O → 2NaOH + Cl2 + H2↑
Quality indicators for Javen water 8% - 12%
| No |
Name of quality indicator |
Unit of measurement |
Javen 8% |
Javen 10% |
Javen 12% |
Testing method |
| 1 |
Appearance characteristics |
- |
Transparent or yellow solution |
Visual observation |
| 2 |
Chlorine content |
g/l |
90±5 |
120±5 |
145±15 |
ASTM D2022-89 |
| 3 |
Chlorine content |
% |
8±0,5 |
10±0,5 |
12±1 |
ASTM D2022-89 |
| 4 |
Excess NaOH content |
g/l |
≤ 10 |
≤ 13 |
≤ 15 |
ASTM D2022-89 |
| 5 |
Excess NaOH content |
% |
≤ 0,85 |
≤ 1,0 |
≤ 1,2 |
ASTM D2022-89 |
Applications of Javen water 8% - 12%
In practice, Javen water is mainly used for the following purposes:
-
Bleaching stains, ink, mold, sap, and yellowing on fabrics.
-
Whitening household items.
-
Disinfecting drinking water, hospitals, homes, and toilets.
-
Killing algae, moss, slime, fungi, etc., in swimming pools, reservoirs, and water containers.
-
Bleaching paper and textiles in the paper manufacturing and textile industries.
Storage and incident handling for Javen water
As a powerful oxidizer and corrosive substance, Javen water requires the use of proper protective equipment. When storing Javen water, consider the following:
-
Store in a cool, dry place, away from direct sunlight, at temperatures below 37°C.
-
Javen water is highly reactive and volatile. At a normal pH of around 6-8, the concentration can significantly drop within 2-3 weeks. In this case, stabilize the solution by adding NaOH.
-
Do not store Javen water with flammable substances, acids, or food.
-
Avoid using metal containers except for titanium and tantalum due to its high corrosiveness. Use PVC containers for storage.
Incident Handling
-
Inhalation: Move the person to a well-ventilated area and seek medical attention.
-
Eye contact: Rinse thoroughly with clean water for 15 minutes and seek medical help.
-
Skin contact: Remove contaminated clothing and wash thoroughly with water.
-
Ingestion: Rinse the mouth thoroughly but do not induce vomiting. Seek medical help immediately.
.png)
Dong A JSC – Your trusted supplier of Javen water 8% - 12%
Javen water 8% - 12% is available in large quantities at Dong A JSC. To place an order, contact the hotline at 0912 536446 (North) or 0914 219 646 (South) or leave your phone number on our website. We will contact you as soon as possible for consultation and pricing.
Choose Dong A JSC for quality-assured Javen water at competitive prices.