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The recommended concentration of fluorid...

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 `[3Ca_(3)(PO_(4))_(2).Ca(OH)_(2)]`

A

`[CaF_2]`

B

`[3 (CaF_2). Ca(OH)_2]`

C

`[3Ca_3 (PO_4)_2. CaF_2]`

D

`[3(Ca(OH)_2. CaF_2)]`

Text Solution

Verified by Experts

The correct Answer is:
C
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^(-)`
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The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teen enamel harder by converting [3Ca_(3) (PO_(4))_(2). Ca(OH)_(2)] to :

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