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What equation is formed when HCl is titrated against Na2CO3 using methyl orange as indicator

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Na2CO3 + 2HCl ==> 2NaCl + H2O + CO2
Going to the methyl orange end point titrates ALL of the Na2CO3. Titrating to the phenolphthalein end point titrates just 1/2 of it; i.e., to NaHCO3.

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