Effects of Acid-Base Reaction with a Metal
In an acid-base reaction with a metal, the metal typically undergoes a displacement reaction where it replaces hydrogen from the acid. This reaction can result in the formation of a salt and the evolution of hydrogen gas.

Example Reactions
1. Reaction of hydrochloric acid (HCl) with zinc (Zn):
Zn + 2HCl → ZnCl2 + H2
In this reaction, zinc displaces hydrogen from hydrochloric acid to form zinc chloride and hydrogen gas is evolved.
2. Reaction of sulfuric acid (H2SO4) with aluminum (Al):
2Al + 3H2SO4 → Al2(SO4)3 + 3H2
Here, aluminum displaces hydrogen from sulfuric acid to produce aluminum sulfate and hydrogen gas.

Explanation
When a metal reacts with an acid, the metal atoms donate electrons to the hydrogen ions in the acid, forming hydrogen gas. The metal ions then combine with the non-metal ions from the acid to form a salt. The reaction can be represented as:
Metal + Acid → Salt + Hydrogen gas
The reactivity of metals with acids depends on various factors, including the metal's position in the reactivity series and the concentration of the acid. More reactive metals, such as sodium and potassium, react vigorously with acids, while less reactive metals, such as copper and silver, may not react with acids under normal conditions.
Overall, when an acid reacts with a metal, it can result in the formation of a salt and the release of hydrogen gas. This type of reaction is commonly used in various industrial processes and chemical experiments.