Answer variants:
Excess base increases hydrogen ions concentration.
Strength of acid decreases.
Acids react with a metal forming salt and hydrogen gas.
1. Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
2. How is the concentration of hydronium ions \(H_3O^+\) affected when a solution of an acid is diluted?