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Please help chem question

Why is there a 2 after Na in this equation? Is it because of the 2- charge on sulfur? But what about the O3 then? Also, how do we go from SO2 to SO3?
The equation:

SO2+2NaOH-->Na2SO3+H2O

This is from.my Chem textbook on period 3 oxides and their reactions with acids/bases
Original post by sorhgv
Why is there a 2 after Na in this equation? Is it because of the 2- charge on sulfur? But what about the O3 then? Also, how do we go from SO2 to SO3?
The equation:

SO2+2NaOH-->Na2SO3+H2O

This is from.my Chem textbook on period 3 oxides and their reactions with acids/bases

Charge on SO3 is -2. Charge on Na is +1. That means it’ll be Na2SO3 as you can bring the charges across. Whatever the charge is (-2) on SO3 will be the number after Na. The charge on sodium is +1 so there won’t be any number after SO3.

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