Sulfuric acid is a weaker acid than hydrochloric acid. Yet hydrogen chloride is evolved when concentrated sulfuric acid is added to sodium chloride. Explain.

Short Answer

Expert verified
Sulfuric acid, despite being weaker than hydrochloric acid, is strong enough to donate a proton to Sodium Chloride. This results in the formation and release (evolution) of Hydrogen Chloride gas.

Step by step solution

01

Understanding the properties of Sulfuric Acid and Sodium Chloride

Sulfuric acid (H2SO4) is a strong acid, and Sodium Chloride (NaCl) is a salt. When they react, Sulfuric acid donates a proton (H+) to Sodium Chloride.
02

Explanation of the reaction

In this reaction, the Sulfuric Acid (H2SO4), being a strong acid, can donate a proton (H+) to the chloride ion (Cl-) of Sodium Chloride (NaCl). This is because the chloride ion (Cl-) is a better nucleophile than the sulfate ion (SO4^2-). The reaction will then proceed as follows: H2SO4 + NaCl -> NaHSO4 + HCl. The HCl gas is then evolved, i.e., the gas is released from the solution.
03

Summary of the process

Despite Sulfuric Acid being a weaker acid than hydrochloric acid, it is still strong enough to donate a proton to Sodium Chloride (NaCl). The reaction results in the formation and evolution of Hydrogen Chloride gas.

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