Which two chemicals are commonly used as sources of fluoride?

Sodium silicofluoride and hydrofluorosilic acid are indeed commonly used as sources of fluoride in water fluoridation processes. These compounds are effective in providing the necessary fluoride ions that contribute to dental health by helping to prevent cavities.

Sodium silicofluoride, when added to drinking water, dissociates into fluoride ions and contributes to the fluoride level within the water supply. Hydrofluorosilic acid is another form often used because it is highly soluble and thus can be easily incorporated into water systems to achieve the desired fluoride concentration.

Understanding the roles of these compounds emphasizes how specialized sources of fluoride are selected based on their solubility, availability, and effectiveness in public health initiatives aimed at reducing tooth decay.