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7 Cards in this Set
- Front
- Back
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Test for Gases (+) positive result |
Carbon dioxide (CO2)
Pass through limewater (calcium hydroxide)
(+) Limewater changes colourless to milky
Excess CO2- milky ppt redissolves= colourless solution |
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Hydrogen (H2)
Put burning splint into unknown gas
(+) Burns with a pop |
Oxygen (O2)
Put glowing splint into gas sample
(+) Splint relights |
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Chlorine (Cl2)
Damp pH paper/ blue litmus paper
(+) Turns red, then bleaches |
Ammonia (NH3)
1. Damp universal indicator paper (+) Turns blue
2. Glass rod dipped into conc HCl (acid) (+) Dense white fumes |
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Hydrogen Chloride (HCl)
1. Damp universal indicator paper (+) Turns red
2. Glass rod dipped in conc ammonia solution (+) Dense white fumes |
(End) |
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Inorganic Identification Tests |
Test for appearance
•Observe colour & state (crystalline/powder)
White crystalline solid--> -Doesn't contain transition metal ions. -Not transition metal compound +Is a group 1, 2 compound or ammonium compound
Blue crystalline solid--> -May contain copper(2) ions -copper(2) compound |
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Testing for solubility in water •Add few spatula measures of solid to a test tube of deionised water and shake to mix. Dissolves to form colourless solution: -SOLUBLE in water -A group 1,2, Al, Zn or NH4 compound Dissolves to form solution (state colour): -SOLUBLE in water -If blue, suggests Copper(2) ions present Doesn't dissolve in water: -INSOLUBLE |
Flame Testing for presence of metal cations in a compound •Dip nichrome wire loop in conc HCl. Touch sample with wire and hold up to blue Bunsen flame. ▪Crimson flame- Lithium ion present ▪Lilac flame (pink through cobalt blue glass)- Potassium ion present ▪Yellow/Orange flame- Sodium ion present
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Brick red flame- Calcium ion present
Green flame- Barium ion present
Blue-green flame- Copper ion present |
(Edit) |
