Question

In Na2CO3.10H2O , WHAT THAT DOT MEANS?

Answer 1

It means that sodium carbonate contains 10 molecules of water in it

Answer 2

Answer:

In Na2Co3.10H2O the dot means that one Sodium Carbonate molecule is holding 10 water molecules of crystallisation. These water of crystallisation makes the salt wet.

And, when we you such Na2Co3.10H2O, it loses moisture and turns white. But, when we again moisten it, it turns back to blue.