5.2 Gas Tests
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How do we test for Hydrogen?
squeaky pop test
How do test for Oxygen?
glowing splint test
How do we test for Water?
anhydrous copper sulphate
What is the colour change in the chemical test for water?
white to blue
What is the physical test for water?
boiling point 100 degrees Celsius
How do we test for Carbon Dioxide?
white precipitate forms - turns cloudy
How do we test for Chlorine?
damp blue litmus paper
What is the colour change when testing for Chlorine?
blue to white (bleaches)
How do we test for Ammonia?
damp red litmus paper
What is the colour change when testing for Ammonia?
red to blue
What are cations?
positive ions
How do we test for cations?
flame test sodium hydroxide test ammonium test
Describe a flame test
• dip platinum wire into HCl • dip into solution • Bunsen flame
Why is a platinum wire used in a flame test?
does not colour the flame
Why is Hydrochloric acid used in a flame test?
clean the wire
What type of flame is used in a flame test?
non luminous Bunsen flame
What colour flame does Lithium produce?
red
Which cation produces red flame?
Lithium
What colour flame does Sodium produce?
yellow
Which cation produces yellow flame?
Sodium
What colour flame does potassium produce?
lilac
Which cation produces lilac flame?
potassium
What colour flame does calcium produce?
orange/red
Which cation produces orange/red flame?
calcium