Question

12.5 gram of commercial sodium bicarbonate on heating gives 3 game of seo2 what is the percentage of purity in sample
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Answer 1

2NaHCO3 = Na2CO3 + CO2 +H2O

168g 22400ml

22400 ml CO2 obtained by = 168 g of NaHCO3

300 ml CO2 obtained by = 168 x 300 /22400

=2.25 g

Percentage purity = 2.25 x 100 /2.5

= 90%