Question

NaOH +(solid)Na2CO3 =

Answer 1

NaOH + Na2CO3 --> no reaction.
This is because, both the reactants being basic in nature.
Hope this helps you.

Answer 2

Hey friend, Harish here.
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Here is your answer:
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NaoH is  a alkali  and Na₂CO₃ is an alkaline salt.

They both do not react with each other as both are basic in nature.

Hence no products are formed. 
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Hope my answer is helpful to you.