Ohio ABC Class 1 Drinking Water Practice Exam

The process of sequestering manganese effectively is best achieved through the combination of polyphosphate and chlorine. Polyphosphate functions by forming stable complexes with manganese, preventing it from precipitating and thus keeping it dissolved in water. This is particularly important in water treatment as it helps in controlling manganese's presence and minimizing its potential staining effects and taste issues.

Adding chlorine enhances the oxidation process, facilitating the transformation of manganese from the soluble divalent form to its oxidized state. The presence of chlorine not only helps in disinfecting the water but also aids in further promoting the sequestering capabilities of polyphosphate by ensuring that manganese remains in a soluble state.

Though sodium silicate can also play a role in sequestering certain metals, it is less effective for manganese when used alone compared to the synergetic action of polyphosphate and chlorine. The combination capitalizes on the strengths of both chemicals to manage manganese levels more effectively, leading to improved water quality.

In summary, the pairing of polyphosphate and chlorine is particularly effective in sequestering manganese, ensuring it is kept in dissolved form and thereby preventing issues in drinking water systems.