Verified Solution • 2025–26 Session moderate

QJEEM23Ch79f1: JEE Main 2023 Chemistry - Class 11 JEEM23Ch79f1 Solution: Number of water molecules in washing soda and soda ash…

Number of water molecules in washing soda and soda ash respectively are :

Multiple Choice Options

  • A 1 and 0
  • B 10 and 1
  • C 1 and 10
  • D 10 and 0

Step-by-Step Verified Solution

  • Washing soda is a hydrated form of sodium carbonate, with the chemical formula Na2CO3·10H2O. This means that each molecule of washing soda contains 10 water molecules.

  • Soda ash is the anhydrous form of sodium carbonate, with the chemical formula Na2CO3. This means that it does not contain any water molecules.

Soda ash is typically produced by heating washing soda to drive off the water molecules. Washing soda can be produced by dissolving soda ash in water and then recrystallizing it.

The correct answer is Option D: 10 and 0.

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