A sample of weight $x$ g containing $N a H C O_{3}$ and $N a_{2} C O_{2}$ consumes $2 g$ equivalents of $H C l$ for complete neuralisation. $x$ g of the same sample was heated strongly and then cooled. The residue is treated with $H C l$ . Find out the number of gram equivalents of $H C l$ that will be required for complete neutralization of residue obtained after heating?

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Solution

When sodium hydrogen carbonate is strongly heated, sodium carbonate is obtained.
$2 N a H C O_{3} Δ \to N a_{2} C O_{3} (s) + H_{2} O ↑ + C O_{2} ↑$
So, residue contains only $N a_{2} C O_{3}$ .
The number of gram equivalents of $H C l$ that will be required for complete neutralization of residue obtained after heating is same as the number of gram equivalents of $H C l$ that will be required for complete neutralization of residue obtained before heating. It is equal to $2$ g.

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