Here's why:
* The Reactivity Series: Metals are arranged in a reactivity series based on their tendency to lose electrons and form positive ions. Metals higher in the series are more reactive than those lower in the series.
* Hydrogen's Position: Hydrogen is placed above silver in the reactivity series. This means that hydrogen is more reactive than silver.
* Reaction Mechanism: When a metal reacts with an acid, the metal loses electrons and forms positive ions, while the hydrogen ions from the acid gain electrons and are reduced to hydrogen gas.
* Silver's Inactivity: Since silver is less reactive than hydrogen, it cannot displace hydrogen from the sulfuric acid. This means that no hydrogen gas is evolved.
Instead of reacting with dilute sulfuric acid, silver reacts with concentrated sulfuric acid (hot) to form silver sulfate, sulfur dioxide gas, and water. This reaction involves the oxidation of silver and the reduction of sulfuric acid, leading to the formation of these products.
In summary, silver's position in the reactivity series, lower than hydrogen, explains why it does not evolve hydrogen gas when reacting with dilute sulfuric acid.
