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Aluminum Phosphate Formula – Structure, Properties, Uses, Sample Questions

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Aluminum phosphate is one of the chemical compounds. It contains 1 Phosphorous atom, 4 Oxygen atoms, (3 shared with single bond & 1 with double bond), and 1 Aluminum atom, Generally it appears as dihydrate means Aluminum phosphate along with 2 water ions as well as pentahydrate means Aluminum phosphate along with 5 water ions.

Aluminum phosphate has many uses in general life, now let us see what is Aluminum Phosphate, its Structure, Properties, and its uses of Aluminum Phosphate.

What is Aluminum Phosphate?

Aluminum phosphate is an amorphous form of aluminum hydroxy phosphate in this some of the hydroxyl groups of aluminum hydroxide are replaced by phosphate groups and it has many uses like flame retardant, Antacid, fungicide, catalyst food added substance, etc.

  • The chemical formula of Aluminum Phosphate is AlPO4. 
  • It is generally occurring as an anhydrous salt and contains dihydrate and Pentahydrate structures. 
    • Dihydrate: AlPO4.2H2O
    • Pentahydrate: AlPO4.5H2O

Structure of Aluminum Phosphate

Aluminum phosphate dihydrate has a group of phosphate anions, aluminum cations, and water. It contains 1 Phosphorous atom, 4 Oxygen atoms, (3 shared with single bond & 1 with double bond), and 1 Aluminum atom, Generally it appears as dihydrate means Aluminum phosphate along with 2 water ions as well as pentahydrate means Aluminum phosphate along with 5 water ions.

Structure of Aluminum Phosphate

Properties of Aluminum Phosphate

Physical Properties of Aluminum Phosphate

  • Aluminum phosphate is a white crystalline powder (A colorless liquid in aqueous form) with a foul odour).
  • The density of Aluminum phosphate is 2.56 g.cm3 in solid-state.
  • The Melting point of Aluminum phosphate is 1800°C.
  • The Aluminum phosphate is decomposed at its Boiling point.
  • Aluminum phosphate is Insoluble in water and very slightly soluble in HCl & HNO3.
  • The molar mass of Aluminum phosphate is 121.9529 g/mol as a white crystalline powder. 
  • The refractive index of Aluminum phosphate is 1.546.

Chemical Properties of Aluminum Phosphate

  • Aluminum phosphate reacts with Hydrochloric acid (HCL) and forms Aluminum trichloride (AlPO4) and Phosphoric acid (H3PO4).

AlPO4 + 3HCl  ⇢  AlCl3 + H3PO4

  • Aluminum phosphate reacts with Magnesium chloride (MgCl2) and forms Aluminum trichloride (AlCl3) and Magnesium phosphate (Mg3(PO4)2.

2AlPO4 + 3MgCl2  ⇢  Mg3(PO4)2 + 2AlCl3

Uses of Aluminum Phosphate

Aluminum phosphate is used in Electronic and Electrical ventures, manufacturing of rubber and Adhesive, assembling Chemotherapeutic medications, and immunizations to improve immunogenicity.

Also, aluminum phosphate is used as a Flame retardant, Antacid, Food added substance, Fungicide, Catalyst, and a white colorant for a very long time, concrete, dental concrete, erosion inhibitors.

Sample Questions

Question 1: Draw the Structure of Aluminum Phosphate.

Answer:

Aluminum phosphate dihydrate has a group of tetra-and octahedral units of phosphate anions, aluminum cations, and water. Al3+ particles are 6-coordinate and PO43-particles are 4-coordinate.

Structure of Aluminum Phosphate

Question 2: What are the Physical Properties of Aluminum Phosphate?

Answer:

Following are the Physical Properties of Aluminum Phosphate:

  • Aluminum phosphate is a white crystalline powder (A colorless liquid in aqueous form) with a foul odour).
  • The density of Aluminum phosphate is 2.56 g.cm3 in solid-state.
  • The Melting point of Aluminum phosphate is 1800°C.
  • The Aluminum phosphate is decomposed at its Boiling point.
  • Aluminum phosphate is Insoluble in water and very slightly soluble in HCl & HNO3.
  • The molar mass of Aluminum phosphate is 121.9529 g/mol as a white crystalline powder. 
  • The refractive index of Aluminum phosphate is 1.546.

Question 3: What are the Chemical Properties of Aluminum Phosphate?

Answer:

  • Aluminum phosphate reacts with Hydrochloric acid (HCL) and forms Aluminum trichloride (AlPO4) and Phosphoric acid (H3PO4).

AlPO4 + 3HCl  ⇢  AlCl3 + H3PO4

  • Aluminum phosphate reacts with Magnesium chloride (MgCl2) and forms Aluminum trichloride (AlCl3) and Magnesium phosphate (Mg3(PO4)2.

2AlPO4 + 3MgCl2  ⇢  Mg3(PO4)2 + 2AlCl3

Question 4: What are the uses of Aluminum Phosphate?

Answer:

The uses of Aluminum Phosphate are:

  • Aluminum phosphate is used in Electronic and Electrical ventures, manufacturing of rubber and Adhesive, assembling Chemotherapeutic medications, and immunizations to improve immunogenicity.
  • Also, aluminum phosphate is used as a Flame retardant, Antacid, Food added substance, Fungicide, Catalyst, and a white colorant for a very long time, concrete, dental concrete, erosion inhibitors.

Question 5: What happens when Magnesium chloride reacts with Aluminum Phosphate?

Answer:

Aluminum phosphate reacts with Magnesium chloride (MgCl2) and forms Aluminum trichloride (AlCl3) and Magnesium phosphate Mg3(PO4)2.

2AlPO4 + 3MgCl2 ⇢ Mg3(PO4)2 + 2AlCl3



Last Updated : 20 Dec, 2023
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