Question

Calcium phosphate is present in tooth enamel, its nature is
(a) basic
(b) amphoteric
(c) acidic
(d) neutral

Answer 1

Calcium phosphate is present in tooth enamel, its nature is basic.

Calcium phosphate is a basic salt. It is a salt comprising a weak phosphoric acid and a stronger calcium hydroxide base. When the pH value of the mouth goes lesser than 5.5, it becomes acidic and the enamel starts to dissolute. This indicates that calcium phosphate is basic in nature.