Formula for sodium carbonate is:

NaCO₂

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na₂CO₃

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Na₂CO₃

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Na₃CO₂

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Solution

The correct option is C
Na₂CO₃

Sodium Carbonate
Symbol: $N a$ $C O_{3}$
Valency: +1 -2

We can use the criss-cross method to find out the chemical formula of a metal and non-metal that combine to form an ionic bond. By this method, the absolute value of the oxidation number of the first ion is used as the subscript of the second, and vice versa. So, we get the formula as

$N a_{2}$ $C O_{3}$ .

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Similar questions

Q. The formula of sodium carbonate is

N a_{2} C O_{3}

The equations given below relate to the manufacture of sodium carbonate (Molecular weight of Na₂CO₃ = 106).
NaCl + NH₃ + CO₂ + H₂O $\overset{}{\to}$ NaHCO₃ + NH₄Cl
2NaHCO₃ $\overset{}{\to}$ Na₂CO₃ + H₂O + CO₂
Questions (a) and (b) are based on the production of 21.2 g of sodium carbonate.
(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate (Molecular weight of NaHCO₃ = 84)?
(b) To produce the mass of sodium hydrogen carbonate, calculate what volume of carbon dioxide, measured at STP would be required?

C O_{2}

gas along with solid (Y) is obtained when sodium salt (X) is heated. (X) is again obtained when

C O_{2}

gas is passed into aqueous solution of (Y). Identify (X) & (Y) respectively

Q. What mass of sodium carbonate,

N a_{2} C O_{3}

is needed to make 120 mL of a 1.5 M solution? (Given formula weight of sodium carbonate = 106 amu)

Q. The common name of sodium carbonate (

N a_{2} C O_{3}

) is washing soda.

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