Question

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WHAT DOES THE "DOT" MEANS IN Na2CO3.10H20

I AM ASKING ABOUT THE DOT AFTER Na2CO3.

Answer 1

even I got this doubt recently.
the dot means combined with.
after the dot, we always find few water molecules.
it is the water of crystallization of the given Na2Co3

Answer 2

Heyyy....
This dot/point represents multiply as in maths we write 1.2=2 In the same way it doesn't represent multiply here it represents combining of two elements. As Na2CO3+10H2O--Na2CO3. 10H2O.
In this reaction it combined two elements here.
Hope u will understand what I want to say....