Answer:
CO₃²¯(aq) + 2H⁺(aq —> H₂O(l) + CO₂(g) 
Step-by-step explanation:
The net ionic equation for sodium carbonate (Na₂CO₃) and sulfuric acid (H₂SO₄) can be obtained as follow:
Na₂CO₃ + H₂SO₄ —>
In solution, Na₂CO₃ and H₂SO₄ will dissociate as follow:
Na₂CO₃(aq) —> 2Na⁺(aq) + CO₃²¯(aq) 
H₂SO₄(aq) —> 2H⁺(aq) + SO₄²¯(aq) 
Na₂CO₃(aq) + H₂SO₄(aq) —>
2Na⁺(aq) + CO₃²¯(aq) + 2H⁺(aq) + SO₄²¯(aq) —> 2Na⁺(aq) + SO₄²¯(aq) + H₂O(l) + CO₂(g) 
Cancel out the spectator ions (i.e Na⁺ and SO₄²¯) to obtain the net ionic equation. 
CO₃²¯(aq) + 2H⁺(aq —> H₂O(l) + CO₂(g)