Qualitative analysis Flashcards
differentiate between cations, anions and gases
How to identify Zinc Cation?
Soluble in both excess sodium hydroxide and aqueous ammonia.
How to identify Aluminium Cation?
Soluble in sodium hydroxide, insoluble in excess aqueous ammonia.
How to identify Calcium Cation?
insoluble in excess sodium hydroxide, insoluble in aqueous ammonia.
How to identify Ammonium Cation?
insoluble in excess sodium hydroxide, no reaction with aqueous ammonia.
How to identify Copper Cation?
blue ppt., insoluble in excess sodium hydroxide, soluble in excess aqueous ammonia with blue solution
How to identify Iron(ii) Cation?
green ppt., insoluble in excess sodium hydroxide and aqueous ammonia.
How to identify Iron(iii) Cation?
red-brown ppt., insoluble in excess sodium hydroxide and aqueous ammonia.
How to identify Carbonate Anion?
dilute acid, effervescence will be observed. limewater turns cloudy with white ppt.
How to identify Chlorine Anion?
dilute acid and silver nitrate, white ppt.
How to identify Iodine Anion?
dilute acid and silver nitrate, yellow ppt.
How to identify Sulfate Anion?
dilute acid and barium nitrate, white ppt.
How to identify Nitrate Anion?
dilute acid, aqueous sodium hydroxide and aluminium, effervesence observed, red litmus paper turns blue.
How to identify Hydrogen gas?
use lighted splint, flame will extinguish with a ‘pop’ sound.
How to identify Oxygen gas?
use glowing splint, splint will relight.
How to identify Carbon dioxide gas?
Bubble thru limewater, effervesence with white ppt.
How to identify Ammonia gas?
use red litmus paper, paper will turn from red to blue.
How to identify Chlorine gas?
Use blue litmus paper, paper will turn blue then white.
How to identify Sulfur gas?
Used acidified Potassium manganate (iiv) paper, paper will turn from purple to colourless.
