Water Nuggets Practice Exam

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Which process is deemed best for sequestering manganese?

Polyphosphates Alone

Polyphosphates and Chlorine

The best process for sequestering manganese involves the combination of polyphosphates and chlorine. This method is effective because polyphosphates have the ability to form stable complexes with metal ions, such as manganese, thereby preventing them from precipitating out of solution. When combined with chlorine, which acts as an oxidizing agent, this combination enhances the overall stability of the complex, allowing for more effective removal of manganese from water systems.

Using solely polyphosphates might not provide the same level of effectiveness as the combination with chlorine since there could still be residual manganese that is not fully sequestered, leading to potential issues such as staining or taste concerns in the finished water. On the other hand, options like sodium or sodium silicate do not offer the dual benefits of complexing and oxidizing that this combination provides, making them less effective for manganese sequestering in comparison.

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Sodium

Sodium Silicate

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