Special type of substances are used to test whether a substance is acidic or basic. These substances are known asindicators. The indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, China rose petals (Gudhal), etc., are some of the naturally occurring indicators.
Name of acid Found inAcetic acid VinegarFormic acid Ant’s stingCitric acid Citrus fruits such as oranges, lemons, etc.Lactic acid CurdOxalic acid SpinachAscorbic acid Amla, Citrus fruits (Vitamin C)Tartaric acid Tamarind, grapes, unripe mangoes, etc.All the acids mentioned above occur in nature Name of base Found inCalcium hydroxide Lime waterAmmonium hydroxide Window cleanerSodium hydroxide/ SoapPotassium hydroxideMagnesium …
substances like these which are bitter in taste and feel soapy on touching are known as bases.The nature of such substances is said to be basic. eg soap, baking soda
These substances taste sour because they contain acids. The chemical nature of such substances is acidic. The word acid comes from the Latin word acere which means sour. The acids in these substances are natural acids.
