What we did in class, we took different solutions and tested to see their reactions in different indicators, to differentiate if it’s an acid base or neutral.
Why did we did this, learning the indicators and their reaction rates with other solution is crucial in chemistry. Even if we didn’t know what the solution was we could find out by using indicators and learn if it’s an acid base or neutral in a safe way.
How this is used in the real world? Sulfuric acid, Acetic acid, Sodium Hyrdoxide are all acids and bases commonly found in the real world with real world applications. Ex/ Acetic acid is used in the manufacture of ink and dyes, of pesticides and food preservatives and of rubber and plastic.