Chapter 9: Acid and Alkali

NEUTRAL*Neutral substances do not change the colour of blue and red litmus paper.*Usually, neutral substances are sweet, salty or tasteless.*Example: oil, salt, rice, salted fish, plain water, bread, sweets, iceALKALINE*Alkaline substances change red litmus paper to blue*Alkaline substances taste bitter.*Alkaline substances have smooth and slippery feel*Example: medicine, coffee, soap, detergent, bitter guard, ginseng.ACIDIC*Acidic substances change blue litmus paper to red.*Acidic substances taste sour.*Example: orange juice, vinegar, tea, grapes, lemon, tomato, pineapple.