Chemical Analysis Flashcards
What is a pure substance
A substance that only contains one compound or element
What is a formulation
A useful mixture with a precise purpose made by following a formula
What are the 7 examples of formulations
fuels
cleaning agents
paints
medicines
alloys
fertilisers
foods
How do you calculate the rf value
Distance traveled by spot / distance traveled by solvent
In chromatography the amount of time that the samples spend in each phase depends on
Solubility
How attracted they are to the paper
What is the positive test for chlorine gas
Bleach blue litmus paper
What is the positive test for oxygen gas
Relight glowing splint
What is the positive test for carbon dioxide gas
Bubble through limewater
Turns cloudy
What is the chemical name for lime water
Calcium hydroxide
What is the positive test for hydrogen gas
Squeaky pop sound
Carbonate + acid —>
Carbon dioxide + water + salt
How do you test for sulphate
Add barium chloride that has been acidified with HCl
What is the positive test for a sulphate ion
White precipitate forms
How do we test for halide ions
Add acidified silver nitrate solution
What is the positive test for a chloride ion
White precipitate
What is the positive test for a bromide ion
Cream precipitate
What is the positive test for a iodide ion
Yellow precipitate
Positive flame test for lithium
Crimson
Positive flame test for sodium
Yellow
Positive flame test for pottasium
Lilac
Positive flame test for calcium
Orange-red
Positive flame test for copper
Green
Sodium hydroxide + calcium
White precipitate
Sodium hydroxide + copper
Blue precipitate
