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(B) When a solution of sodium carbonate $(Na_2CO_3)$ reacts with mercuric chloride $(HgCl_2)$,the initial product formed is mercuric carbonate $(HgCO_

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$HgCO_3 \cdot HgO$

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(B) When a solution of sodium carbonate $(Na_2CO_3)$ reacts with mercuric chloride $(HgCl_2)$,the initial product formed is mercuric carbonate $(HgCO_3)$.However,$HgCO_3$ is unstable and undergoes hydrolysis or decomposition to form a basic salt,which is known as mercuric carbonate basic or $HgCO_3 \cdot HgO$.The reaction is: $2HgCl_2 + 2Na_2CO_3 + H_2O 	o HgCO_3 \cdot HgO + 4NaCl + CO_2$.

The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is

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