Tests For Ions And Gases Flashcards
How to perform a flame test
Dip a piece of nichrome wire into the salts containing ions and then place in a flame
Lithium burns with a … Flame
Crimson red
Sodium burns with a … Flame
Yellow Orange
Potassium burns with a … Flame
Lilac
Calcium burns with a .. Flame
Brick red / orange red
Copper reacts with Sodium hydroxide to form a … Precipitate
Blue
Iron (II) reacts with sodium hydroxide to form a … Precipitate
(‘Dirty’) green
Iron (III) reacts with sodium hydroxide to form a … Precipitate
Orange brown (‘rust’)
Test for ammonium ions (NH(4+)) by…
Heating gently and add sodium hydroxide solution. It will give off a distinctive smell of ammonia (NH3)
Ammonia (NH3) can be tested by…
Using damp red litmus paper. Since it is alkaline it will turn damp red litmus paper blue
Test for hydrogen by…
Holding a lot splint in presence of hydrogen. It produces a squeaky pop
Test for oxygen by…
Holding a glowing splint in the gas. If it is oxygen the splint will relight
Test for Carbon dioxide
Bubble it through limewater, which will turn cloudy
Test for ammonia by….
Holding damp red litmus paper in ammonia gas, which will turn the damp red litmus paper blue
Test for chlorine by…
Holding damp blue litmus paper on chlorine gas, which will turn it red then white
