Which of the following is potash alum?

This question was previously asked in
SSC CGL 2022 Tier-I Official Paper (Held On : 07 Dec 2022 Shift 4)
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  1. Na2SO4Al2(SO4)3.24H2O
  2. K2SO4Al2(SO4)3.24H2O
  3. K2SO4Al2(SO4)3.12H2O
  4. Na2SO4Al2(SO4)3.20H2O

Answer (Detailed Solution Below)

Option 2 : K2SO4Al2(SO4)3.24H2O
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PYST 1:SSC CGL 2023 - Quantitative Aptitude(Held On:14 Jul 2023 Shift 1)
25 Qs. 50 Marks 20 Mins

Detailed Solution

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The correct answer is K2SO4Al2(SO4)3.24H2O

Key Points

  • Potash alum or potassium aluminum sulfate is a double salt of Potassium and Aluminium.
  • It is also known as fitkari.
  • FormulaK2SO4.Al2(SO4)3.24H2O ( sometimes also written as KAl(SO4)2·12H2O)

Additional Information

  • Potash alum
    • It is a coagulant widely used in water treatment.
    • Used as a Fire Retardant.
    • An aqueous solution of potash alum is acidic.
    • Highly soluble in water.
  • Double Salt-
    • A crystalline salt in which there are two different anions and/or cations.
    • Double salts only exist in the solid.
    • When dissolved they act as a mixture of the two separate salts.

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