Soda and acid water based extinguishers are effective on:

Soda and acid water-based extinguishers are designed to combat Class A fires, which involve ordinary combustible materials such as wood, paper, and textiles. The use of water as a extinguishing agent is highly effective for these types of fires because it cools the burning material, lowers the temperature below its ignition point, and helps suppress the flames.

Class A fires are typically fueled by materials that readily absorb water; hence, soda and acid can enhance the effectiveness of water by promoting foamy action that blankets the fuel, reducing the spread of flames. It's important to note that using these extinguishers on other classes of fires could be dangerous. For example, applying water on Class B fires, which involve flammable liquids, or Class C fires, which involve electrical equipment, can exacerbate the situation, leading to more hazardous conditions. In summary, soda and acid water-based extinguishers are specifically formulated to address the characteristics of Class A fires effectively.