This presentation discusses acids, bases and salts. It defines acids as sour substances that turn litmus red, and lists common examples like citric acid. Bases are defined as bitter substances that turn litmus blue, with examples like sodium hydroxide. Common acids found in foods like vinegar, citrus fruits, and curd are identified. Indicators are substances that change color in acids and bases, and examples like litmus paper and turmeric are described. Neutralization reactions between acids and bases are covered, noting they produce heat and a salt. An activity is presented testing different solutions with indicators like litmus and china rose to identify them as acidic or basic.