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Such properties to classify substances and materials into different categories. Some materials, like lemon, vinegar and tamarind have a sour taste. These materials taste sour due to the presence of chemicals called acids. Other materials, like baking soda and soap, have a bitter taste. It is due to the presence of chemicals called bases. Caution: It is dangerous to taste any unknown substance, either at home, or in school. The term acid has been derived from the Latin word 'acidus', which means 'sour'. All sour-tasting materials contain acids. Acids are classified into two categories: Mineral Acids Acids, which are prepared from the minerals present in the earth, are called mineral acids. Hydrochloric acid (HCl), sulphuric acid (H₂SO₄), nitric acid (HNO₃), sulphurous acid (H₂SO₃) and phosphoric acid (H₃PO₄) are some of the well-known mineral acids.

Such properties to classify substances and materials into different categories. Some materials, like lemon, vinegar and tamarind have a sour taste. These materials taste sour due to the presence of chemicals called acids. Other materials, like baking soda and soap, have a bitter taste. It is due to the presence of chemicals called bases. Caution: It is dangerous to taste any unknown substance, either at home, or in school. The term acid has been derived from the Latin word 'acidus', which means 'sour'. All sour-tasting materials contain acids. Acids are classified into two categories: Mineral Acids Acids, which are prepared from the minerals present in the earth, are called mineral acids. Hydrochloric acid (HCl), sulphuric acid (H₂SO₄), nitric acid (HNO₃), sulphurous acid (H₂SO₃) and phosphoric acid (H₃PO₄) are some of the well-known mineral acids.