Chemical tests, bio and chem
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卡片预览 (24 张)
Test for Glucose (reducing sugar)
Benedict’s solution to a sample and heat. turns blue -> green/orange/brown/brickred. depending on the concentration of glucose.
Test for Starch
Iodine to the sample orange brown -> blue/black
Test for Protein
Biuret solution to the sample blue->violet/purple
Test for Lipids
Add ethanol and shake, equal amount of cold water Cloudy white emulsion forming
Test for Carbonate CO3 anion
Add dilute acid Bubbling, CO2 produced
Test for Chloride solution anion
Acidify with acid and add silver nitrate White Precipitate
Test for Nitrate NO3 anion
Sodium Hydroxide, cover with aluminium foil and warm Ammonia produced
Test for Sulfate SO4 anion
Add acid, and barium nitrate White precipitate
Ammonium NH4 cation
Sodium Hydroxide -> ammonia produced after warming
Calcium Ca cation
Sodium Hydroxide -> white precipitate
Copper Cu cation
Sodium Hydroxide -> light blue precipitate
Iron (II) Fe 2+ cation
Sodium Hydroxide -> Green precipitate
Iron (III) Fe 3+ cation
Sodium Hydroxide -> Red-Brown precipitate
Zinc (Zn 2+) cation
Sodium Hydroxide -> white precipitate, colourless solution in excess
Test for Ammonia (NH3) gas
Turns damp red litmus paper -> Blue
Test for Carbon DIoxide (CO2) gas
Turns limewater -> milky white
Test for chlorine (Cl2) gas
Bleaches damp litmus paper
Test for Hydrogen (H2) gas
“Pops” with a lighted splint
Test for Oxygen (O2) gas
Relights a glowing splint
Colour for Lithium test (Li) flame test
Red
Colour for Sodium test (Na) flame test
Yellow
Colour for Potassium test (K) flame test
Lilac/Purple
Colour for Copper test (Cu) flame test
Blue-Green
Test for water x2
White Copper (II) Sulfate -> Blue Cobalt (II) Chloride -> Pink