6.1 PROPERTIES OF ACID AND ALKALI FLi p book BY GOH XINHENG 2 EMERALD
Sour Taste Bitter Less than 7 pH value Morethat 7 Turns bluelitmus paper red(only with water) Test withlitmuspaper Turns red litmus paper blue(only with water) Hydrogengas isproduced Reaction with metals No reaction Carbon dioxidegas isproduce Reaction withcarbonates No reaction Yoghurt, Lemonjuice, Vinegar Example Shampoo, Toothpaste, Soap Similarities of acid and alkali a)Both dissolves in water b)Corrosive if concentrated Differences between acid and alkali
Used to measure the acidity and alkalinity of a substance 1. 2. Strong acid has low pH value (0-2) whereas strong alkali has high ph value(13-14) 3. Neutral substance has pH value of 7. Examples are pure water and salt. pH scale!
Indicator Acid Alkali Neutral Litmuspaper Blueto red Red to blue Purple Universal indicator Yellow Purple Green Methyl orange Red Yellow Orange Phenolphthalein Colourless Pink Colourless Colours of indicators in acidic,alkaline and neutral solution:
Sulphuric acid Sodium hydroxide Formicacid Ammonia solution Used incar batteries Used to makesoap Used inthe coagulation of latex Used to prevent the coagulation latex Uses of acid and alkali