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Introduction to Sulphuric Acid

8. name the g...

Question

8. name the gas evolved when dilute HCL reacts with sodium hydrogencarbonate. How is it recognized

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Solution

The gas evolved when sodium hydrogencarbonate reacts with dilute HCl is carbon dioxide.
NaHCO₃ + HCl â†’ NaCl + H₂O + CO₂
This gas is identified by passing it through lime water. When carbon dioxide gas is passed through lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water. Following is the chemical equation for the reaction
Ca(OH)₂ + CO₂ â†’ CaCO₃ + H₂O

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