Question

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 [3ca3(po4)2.Ca(oh)2] to

Answer 1

Hello dear,

● Answer-
3 Ca3(PO4)2.CaF2

● Explaination-
Tooth enamel is chemically
calcium phosphate hydroxyapatite.

In the process of demineralization of teeth, flourine converts calcium phosphate hydroxyapatite to calcium phosphate fluorapatite.

3 Ca3(PO4)2.Ca(OH)2 + 2 F- ---> 3 Ca3(PO4)2.CaF2 + 2 OH-

Hope this is helpful.
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