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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

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

B

`[CaF_(2)]`

C

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

D

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

Text Solution

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The correct Answer is:
D
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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 :

Ca_(3)(PO_(4))_(2) is :

Ca_(3)(PO_(4))_(2) +H_(2)SO_(4) to

If concentration of fluoride ion is upto 1ppm, then which of the following options may be correct:

The presence of soluble fluoride ion upto 1 ppm concentration in drinking water , is :

F^(-) ions make enamel on teeth harder by converting hydroxy apatite into

What is the concentration of H_3O^+ and OH^- ions in water at 298 K ?

Assertion: The deficiency of fluoride in drinking water cause disease such as tooth decay etc. Reason: The F^(-) ions make the enamel on teeth much harder by converting hydroxyapatite, the enamal on the surface of the teeth, into much harder fluorapatite.

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