Sodium carbonate, also known as washing soda, is used in water treatment for several purposes due to its chemical properties. Here's a brief explanation in English:
Sodium carbonate acts as a water softener by precipitating out calcium and magnesium ions, which are responsible for water hardness. When sodium carbonate is added to water, it reacts with calcium and magnesium ions to form insoluble calcium carbonate and magnesium carbonate, which can then be filtered out. This process reduces the hardness of the water, making it less likely to cause scale buildup in pipes and on surfaces.
Additionally, sodium carbonate can be used to adjust the pH of the water. It is a base, and when dissolved in water, it produces hydroxide ions (OH-), which can neutralize acidic compounds and raise the pH of the water to a more alkaline level. This is important in water treatment to prevent corrosion in pipes and to ensure that the water is safe for various industrial or domestic uses.
Furthermore, sodium carbonate can be used as a cleaning agent in water treatment processes. It helps to remove organic and inorganic deposits from surfaces by emulsifying oils and fats and by saponifying grease, making it easier to clean and maintain water treatment equipment.
In summary, sodium carbonate is used in water treatment to soften water, adjust pH levels, and assist in cleaning processes, all of which contribute to the overall quality and usability of the water.
