Bring the solution back to its original uniform color and repeat the demonstration again. Use a weak acid such as acetic acid and a weak base such as ammonia and after a few times the demonstration ...

An acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with their ...

A soluble base dissolves in water to form ... Watch this video of a practical demonstration in which copper carbonate and sulfuric acid react to produce copper sulfate.