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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
Question
Calcium phosphate is present in tooth enamel. Its nature is:
  1. Basic.
  2. Acidic.
  3. Neutral.
  4. Amphoteric.
✓

Answer

  1. Basic.

Explanation: Calcium phosphate Ca3(PO4)2 is salt of weak acid and strong base so it is a basic salt.

$3\text{Ca(OH)}_2\ \ +\ \ 2\text{H}_3\text{PO}_4\ \ \ \rightarrow\ \ \ \text{Ca}_3\text{(PO}_4)_2\ \ +\ \ 6\text{H}_2\text{O}\\\text{Calcium}\ \ \ \ \ \ \ \ \ \ \text{Phosphoric}\ \ \ \ \ \ \ \ \ \ \text{Calcium}\\\text{Hydroxide}\ \ \ \ \ \ \ \ \text{acid}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Phosphate}$

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