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  • Calcium phosphate is present in tooth enamel. Its nature is (a) basic (b) acidic (c) neutral (d) amphoteric

Calcium phosphate is present in tooth enamel. Its nature is

(a) basic

(b) acidic

(c) neutral

(d) amphoteric

Answers (1)

Answer: (a)

3Ca(OH)_{2}+2H_{3}PO_{4}\rightarrow Ca_{3}\left ( PO_{4} \right )_{2}+6H_{2}O

Calcium phosphate Ca_{3}\left ( PO_{4} \right )_{2} is basic salt, as it is a salt of weak acid (phosphoric acid) and slightly stronger base (calcium hydroxide). Also, when pH of our mouth falls below 5.5 due to eating of sweets etc., i.e., mouth is acidic, the dissolution of enamel (calcium phosphate) starts which shows that calcium phosphate is basic in nature

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