Effect Of Heat On Salts Flashcards
Name five methods to identify cations and anions.
Colour of salt
Solubility of salt
Gas test
Effect of heat on the salt
Confirmatory test for cations
How to identify HCl and SO²
Colourless, pungent and turns blue litmus red
HCl -> produces white fumes with ammonia vapours
SO² -> Decolourises purple colour of acidified potassium permanganate
Changes color of acidified potassium dichromate(VI) from orange to green.
What is the confirmatory test for oxygen gas?
Relights a glowing wooden splinter.
What is the confirmatory test for hydrogen gas?
Produces a ‘pop’ sound with a lighted wooden splinter.
How do you test for carbon dioxide gas?
Turns limewater cloudy.
Damp blue litmus to red
What is the confirmatory test for ammonia gas?
Colourless pungent smell
Turns moist red litmus paper blue.
Produces thick white fumes with hydrogen chloride gas.
How can you confirm the presence of chlorine gas?
Bleaches moist red litmus paper.
Greenish yellow gas
Turns moist blue litmus paper red, then bleaches it.
Which gas turns moist blue litmus paper red and is associated with brown fumes?
Nitrogen dioxide gas.
How do you confirm the presence of sulphur dioxide gas?
Decolorises an acidified potassium manganate(VII) solution.
What happens to
white anhydrous copper(II) sulphate
blue cobalt(II) chloride paper
when exposed to water vapor?
It turns blue.
It turns pink
What is the color change when heating zinc nitrate (ZnNO3)2?
Turns yellow when hot and white when cool.
What happens to iron² and iron³ nitrate upon heating?
No change
Green
Brown
What nitrate salts are white before and after heating
K
Na
Ca
Mg
Al
Sn
Effects of heat on Pb(NO3)2
Brown when hot
White when cool
Effects of heat on Cu(NO3)2
Changes from blue to black
