Flame tests Flashcards
Describe the flame test
- Clean nichrome wire with concentrated HCl
- Place over blue flame to dry until no colour is present
- dip into HCL again
- scoop some of the soild(powder needed)
- place at the edge of the flame and observe colour change
- repeat with different solids
What is the result for copper in the flame test
Blue
What is the result for Lithium in the flame test
Crimson
What is the result for Calcium in the flame test
Brick red/ Orange
What is the result for Potassium in the flame test
Lilac
What is the result for Sodium in the flame test
Yellow/Orange
What is a percipitate
It is a solid formed in a reaction (Insoluble)
what does copper (cu3+ ) form in precipitation with sodium hydroxide
Blue precipitate
what does Aluminium(Al3+) form in precipitation with sodium hydroxide
White precipitate
what does Calcium(ca2+ ) form in precipitation with sodium hydroxide
White precipitate
what does Iron 2 (Fe2+ ) form in precipitation with sodium hydroxide
Green precipitate
what does Iron3 (Fe3+ ) form in precipitation with sodium hydroxide
Brown precpitate
What happens it Aluminium ions in excess Sodium Hydroxide
Dissolves in excess
What is the test for Carbonates
Dilute acid and limewater
What is the result it carbonates are present and why?
Colourless to cloudy ( Carbon dioxide reacts with limewater for observation)
What is the test for halides
Adding nitric acid and silver nitrate
Why is nitric acid added for the test if halides
To remove any impurities (e.g, OH-)
What is precipitate of Chlorine
White precipitate
What is the precipitate for Bromine
Cream precipitate
What is the precipitate of Iodine
Yellow precipitate
What is the precipitate of Flourine
and what mistake can be done with fluorine
Colourless solution ( If impurities aren’t removed it will form a white precipitate and could be mistaken for chlorine)
What is the test for sulphates
Adding Hydrochloric acid and Barium chloride
What is precipitate if sulphates are present
White precipitate
How do you test for Carbon dioxide
Bubble co2 gas in limewater
What is the test for chlorine
Place a damp blue litmus paper into a test tube with chlorine gas
What is the test for Hydrogen
Place a lit splint into a test tube with hydrogen gas
What is the test for oxygen
Place a glowing splint into a test tube containing oxygen gas
What is the result for hydrogen test
Squeaky pop sound
What is the result for a chlorine test
Bleaches damp blue litmus paper
What is the result for carbon dioxide test
Turns limewater cloudy
What is the result for the oxygen gas test
Relights glowing splint
