$6.2$ g of a sample containing $N a_{2} C O_{3}, N a H C O_{3}$ and non-volatile inert impurity on gentle heating loses $5 %$ of its weight due to reaction as shown below:

$2 N a H C O_{3} \to N a_{2} C O_{3} + H_{2} O + C O_{2}$

Residue is dissolved in water and formed $100$ mL solution and its $10$ mL portion requires $7.5$ mL of $0.2 M$ aqueous solution of $B a C l_{2}$ for complete precipitation of carbonates. Determine the weight (in g) of $N a_{2} C O_{3}$ in the original sample (as nearest integer).

Q. A

100 g

pure sample of

N a H C O_{3}

was heated until

11.2 L

C O_{2} (g)

was collected at

S T P

. What percentage of the

N a H C O_{3}

had decomposed?

N a H C O_{3} (s) \to N a_{2} C O_{3} (s) + H_{2} O + C O_{2}

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A 2.0 g sample containing Na2CO3 and NaHCO3 loses 0.248 g when heated to 300oC, the temperature at which NaHCO3 decomposes to Na2CO3,CO2 and H2O. The % of Na2CO3 in the mixture is (as the nearest integer):

A $2.0$ g sample containing ${N a}_{2} C O_{3}$ and $N a H C O_{3}$ loses $0.248$ g when heated to $300$ $^{o} C$ , the temperature at which $N a H C O_{3}$ decomposes to ${N a}_{2} C O_{3}, C O_{2}$ and $H_{2} O$ . The $%$ of ${N a}_{2} C O_{3}$ in the mixture is (as the nearest integer):