what is the full name of this compound?

Question

NaNO2⋅2H2O

Answer 1

NaNO2 * 2H2O

 

Sodium nitrite dihydrate

 

 

2H2O represent water of cystallization

Answer 2

That is sodium nitrite dihydrate. 

 

This is the hydrated form of the sodium nitrite salt.  The "dot-2H₂O" means that in the crystal structure there are two molecules of water for every formula unit of the salt.  Or we can say 2 moles of water for every mole of the salt.