Question

When concentrated h2so4 is added to Nacl solid, then
HCI gas is liberated because​

Answer 1

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When concentrated sulphuric acid is added to NaCl, then sodium bisulphate and HCl gas is formed. Another reaction also takes place simultaneously, that between NaCl and H2SO4 forming sodium sulphate and HCl.

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Answer 2

When concentrated H2SO4 is added to NaCl solid, then  HCI gas is liberated because a double displacement reaction takes place.

- The reaction between NaCl and H2SO4 is given as:

2 NaCl (s) + H2SO4  → Na2SO4 (s) + 2 HCl (g)

- As sulphuric acid is a very strong acid, there is a reaction between it and solid NaCl.

- Here, Sodium displaces hydrogen to form sodium sulphate and hydrogen displaces sodium to liberate hydrogen chloride gas.

- So it is termed as a double displacement reaction.