Match the following 1. Acids (a) Natural indicator 2. Turmeric (b) Neutraliser 3. Bases (c) Washing soda 4. Sodium carbonates (d) Bitter and soapy 5. Antacids (e) Sour

(i) Acids are generally sour in taste. It also has corrosive nature. It turns blue litmus red. (ii) Natural Indicator is a type of indicator that can be found naturally and can determine whether the substance is an acidic substance or a basic substance. Turmeric, litmus, china rose petals, etc., are the most common examples. (iii) Bases are bitter in taste and they feel soapy to touch. It turns red litmus to blue. (iv) The common name of Sodium carbonates is Washing soda. It is used as detergents. It is the inorganic compound with the formula Na 2 CO 3 . (v ) During acidity, our stomach produces excess hydrochloric acids. An antacid contains base. This base neutralises the excess acids in the stomach. 1. Acids (e) Sour 2. Turmeric (a) Natural indicator 3. Bases (d) Bitter and soapy 4. Sodium carbonates (c) Washing soda 5. Antacid (b) Neutraliser