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Note that we are omitting the water.

So, sodium carbonate will basically dissociate into positive sodium ions and negative carbonate ions based on the following equation:
 Na2CO3 → 2 Na(+) + CO3(2-)

If we took water into consideration:
Sodium carbonate will dissociate in water forming carbonic acid and sodium hydroxide. Since sodium hydroxide is a strong base, therefore, it will then neutralize the gastric acid, thus, acting as an antacid.

In water Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.

The dissociation reaction for Sodium carbonate is

[tex]\rm \bold{ Na_2CO3 \rightarrow 2 Na^(^+^) + CO_3^(^2^-^)}[/tex]

In water the sodium ion will react with [tex]\rm \bold {OH^-}[/tex] ion of water to form Sodium Hydroxide.

[tex]\rm \bold{ Na_2CO3_(_a_q_)+H_2O \rightarrow 2 NaOH + CO_2}[/tex]

Hence we can conclude that in water, Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.

To know more about water dissociation reaction, refer to the link:

https://brainly.com/question/5687191?referrer=searchResults

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