Why can washing soda be called a hydrated salt?
Answer and explanation
Correct answer: Because it contains water of crystallisation
A hydrated salt contains a definite number of water molecules within its crystal structure. Washing soda is sodium carbonate decahydrate, Na2CO3·10H2O, so each formula unit is associated with ten molecules of water of crystallisation. Therefore, option A is correct. It is still an ionic salt; it is not merely water, ion-free, or a gas, as claimed by the other options.
Frequently asked questions
What is the correct answer to this question?
Because it contains water of crystallisation
Why is this the correct answer?
A hydrated salt contains a definite number of water molecules within its crystal structure. Washing soda is sodium carbonate decahydrate, Na2CO3·10H2O, so each formula unit is associated with ten molecules of water of crystallisation. Therefore, option A is correct. It is still an ionic salt; it is not merely water, ion-free, or a gas, as claimed by the other options.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
