Environmental Chemistry

Environmental Chemistry

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

  • [3{Ca(OH)2}. CaF2]

  • [CaF2]

  • [3(CaF2). Ca(OH)2]

  • [3Ca3(PO4)2. CaF2]

Answer

D.

[3Ca3(PO4)2. CaF2]

3Ca3(PO4)2. Ca(OH)2] + 2F-   3Ca3(PO4)2.CaF2] Harder Teeth enamel+2OH-

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