JEE Main | 2018Chemical BondingHard

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 :

Options

A.

[3(CaF2)·Ca(OH)2]

B.

[3(Ca3(PO4)2·CaF2]

C.

[3(Ca(OH)2]·CaF2]

D.

[CaF2]

Solution

 

[3Ca3(PO4)2 . Ca(OH)2] + 2F- (drinking water upto 1ppm)→[3Ca3(PO4)2.CaF2]  +  (Harder teeth enamel)2OH-

 

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