Calcium Phosphate - Ca3(PO4)2

What is Calcium Phosphate?

Calcium phosphate is a calcium salt of phosphoric acid with a chemical formula Ca3(PO4)2. It is also known as Calcium phosphate tribasic or Tricalcium Phosphate.

Calcium phosphate appears as a white amorphous or crystalline powder that is odourless and tasteless. It is insoluble in ethanol, acetic acid but soluble in dilute nitric acid and hydrochloric acid. It slightly dissolves in water. It is found in bones, milk, teeth, and ground.

Apatite is a mineral rock which is an impure and complex form of calcium phosphate which produces tribasic calcium phosphate. An apatite is a form of phosphorite which contains calcium phosphate mixed with other compounds.

Preparation of Calcium Phosphate

It can also be produced by reacting phosphoric acid (H3PO4) with solid calcium hydroxide Ca(OH)2

Ca(OH)2+H3PO4Ca3(PO4)2+H2O (unbalanced)

3Ca(OH)2+2H3PO4Ca3(PO4)2+6H2O (balanced equation)

Dibasic calcium phosphate can be produced in the former of these reactions by using an aqueous solution of calcium hydroxide. Monobasic calcium phosphate is obtained by adding excess phosphoric acid to either a dibasic solution or a tribasic calcium phosphate solution and letting the solution to evaporate.

Properties of Calcium Phosphate – Ca3(PO4)2

Ca3(PO4)2 Calcium phosphate
Molecular Weight/ Molar Mass 136.06 to 310.20 g/mol
Density (tribasic) 3.14 g/cm³
Boiling Point Decomposes
Melting Point (tribasic) 1670°C

Structure of Ca3(PO4)2

Structure of Calcium Phosphate

Structure of a Calcium Phosphate Molecule

Uses of Calcium phosphate (Ca3(PO4)2)

  • Calcium phosphate is used as an antacid and dietary supplement in veterinary medicine.
  • It is used in medicine as calcium replenisher.
  • It is used as a buffer in food.
  • It is used stabilizer in plastics.
  • It is used in the manufacturing of milk glass.
  • It is used in the production of fertilizers.
  • It is used in the manufacture of luminescent materials.
  • It is used to clarify sugar syrups.
  • It is used in dental powders.

Health Hazards Associated with Calcium Phosphate

When the toxic doses ingested become more than 2 g/kg unusual skin sensitization occurs. Inhaling it may cause chemical pneumonitis.

Frequently Asked Questions

What are the benefits of calcium phosphate?

It can be used to treat disorders caused by low levels of calcium such as bone loss (osteoporosis), weak bones (osteomalacia / rickets), reduced parathyroid gland function (hypoparathyroidism), and some muscle disease (latent tetanus).

Is calcium phosphate safe in food?

Calcium can make such drugs more difficult for your body to absorb. Calcium phosphate functions better when it’s taken with food. And ensure that you can take calcium phosphate safely, notify your doctor if you have any of the following conditions: a history of kidney stones.

How do you make calcium phosphate fertilizer?

Method of producing calcium phosphate fertilizer from a calcium-containing material, reactive with diluted phosphoric acid to create calcium phosphate fertilizer, calcium silicate and diluted phosphoric acid consisting of mixing the fine calcium-containing material with diluted phosphoric acid containing by weight of H3PO4 at least 30 to 40 per cent.

What is calcium phosphate used for?

Calcium is important for many normal body functions, especially bone formation and maintenance. Also, calcium can bind to other minerals (such as phosphate), and help remove them from the body. Calcium phosphate is used to avoid calcium shortages, and to treat them.

Is calcium phosphate soluble in water?

Calcium is important for many normal body functions, especially bone formation and maintenance. Also, calcium can bind to other minerals (such as phosphate), and help remove them from the body. Calcium phosphate is used to avoid calcium shortages, and to treat them.


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