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The recommended concentration of fluorid...

The recommended concentration of fluoride ion in drinking water is upto 1 ppm as fluoride ion is required to make teeth enamel harder by converting
`[3Ca_(3)(PO_(4))_(2)*Ca(OH)_(2)]" to "`-----

A

`[3Ca_(3)(PO_(4))_(2)*CaF_(2)]`

B

`[3{Ca(OH)_(2)}*CaF_(2)]`

C

`[CaF_(2)]`

D

`[3(CaF_(2))*Ca(OH)_(2)]`

Text Solution

Verified by Experts

Generally, tooth enamel is hydroxyapatite `[3Ca_(3)(PO_(4))_(2)].` Fluoride ion `(F^(Theta))` reacts with hydroxyapatite to form more rigid solid compound fluorapatite
`[3Ca(PO_(4))_(2).Ca(OH)_(2)]overset(F-)rarr [3Ca_(3)(PO_(4))_(4).CaF_(2)]`
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