The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ions are required to make teeth enamel harder by converting $[3 C a_{3} (P O_{4})_{2} . C a (O H)_{2}]$ to

[3 C a (O H)_{2} . C a F_{2}]

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C a F_{2}

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[3 (C a F_{2}) . C a (O H)_{2}]

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[3 C a_{3} (P O_{4})_{2} . C a F_{2}]

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Solution

The correct option is D $[3 C a_{3} (P O_{4})_{2} . C a F_{2}]$
Tooth enamel is chemically calcium phosphate hydroxyapatite.

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

$3 C a_{3} (P O_{4})_{2} . C a (O H)_{2} + 2 F^{-} \to 3 [C a_{3} (P O_{4})_{2} . C a F_{2} + 2 O H^{-}$

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[3 C a_{3} (P O_{4})_{2} . C a (O H)_{2}]

[3 C a_{3} (P O_{4})_{2} . C a (O H)_{2}]

F^{-}

1 ppm

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