The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3 Ca_3(PO_4)_2. Ca(OH)_2] to

The recommended concentration of fluoride ion in drinking water is up

1.	The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3 Ca_3(PO_4)_2. Ca(OH)_2] to
Answer» `[CaF_2]` `[3 (CaF_2). Ca(OH)_2]` `[3Ca_3 (PO_4)_2. CaF_2]` `[3(Ca(OH)_2. CaF_2)]` SOLUTION :Tooth enamel is mostly HYDROXYAPATITE `[3 Ca_3(PO_4)_2. Ca(OH)_2]. F^(-)`ions CONVERT this into much larger fluorapatite `[3 Ca_3(PO_4)_2. CaF_2] [3 Ca_2 (PO_4)_2. Ca(OH)_2 ] + F^(-) to [3Ca_3(PO_4)_2 . CaF_2] + 2OH^(-)`