Unit 5 Inorganic analysis

Flame test for Sodium

Yellow

Flame test for Lithium

red

Flame test for strontium

crimson

Flame test for magnesium

no colour

Flame test for potassium

lilac

Flame test for calcium

brick red

Flame test for Barium

Apple green

Flame test for caesium

Blue violet

Flame test for Rubidium

Red violet

Test for carboxylic acid

It will produce effervescence when it reacts with NaCO₃ and NaHCO₃. The bubbles released turn limewater milky

Solubility of Mg(OH)₂

Insoluble white ppt

Solubility of Ca(OH)₂

sparingly soluble

Solubility of Sr(OH)₂

Moderately soluble

Solubility of Ba(OH)₂

Soluble

Solubility of MgSO₄

Soluble

Solubility of CaSO₄

moderately soluble

Solubility of SrSO₄

Sparingly soluble

Solubility of BaSO₄

Insoluble

Solubility of group 2 carbonates

insoluble

Addition of chloride to silver nitrate

White ppt

Addition of ammonia to ppt

Dissolves in dilute ammonia

Addition of Bromide to silver nitrate

cream ppt

Addition of ammonia to ppt

Dissolves in concentrate ammonia

Addition of iodide to silver nitrate

yellow ppt

Addition of ammonia to ppt

Does not dissolve

Cr³⁺

Green

Cr₂O₇^2-

Orange

Fe²⁺

Pale green

Co²⁺

Pink

CrO₄^2-

Yellow

MnO₄^-

Purple

Fe³⁺

Red brown

Cu²⁺

Pale blue

Observations when OH- is added to Fe²⁺

Pale green solution to Dark green precipitate

Observations when OH- is added to Fe³⁺

Yellow solution to Red-brown precipitate

Observations when OH- is added to Cu²⁺

Pale blue solution to Pale blue precipitate

Observations for when Cr³⁺ is added to OH^-

Green solution to grey green precipitate

Observations when excess OH- is added to Cr³⁺

grey green precipitate dissolves giving a deep green solution

[Fe(H₂O)₆]²⁺

Pale green

[Fe(H₂O)₆]³⁺

Yellow

Test for oxygen gas

Glowing splint held in a test tube and splint relights

Test for Hydrogen gas

Lighted splint held in a test tube and pop sound heard

Test for carbon dioxide

Gas bubbled through limewater and it turns milky

Test for nitrogen gas

Use a lighted splint in a test tube and nothing would happen

Observations of carbon tetrachloride with water

it doesn’t react it only forms a separate liquid layer

Observations of Silicon tetrachloride with water

Silicon tetrachloride reacts quickly and quite violently with water, forming a white precipitate of silicon dioxide (SiO2) and misty fumes of HCl

What are the 2 soluble lead salts

lead (II) nitrate, Pb(NO3)₂ and lead (II) ethanoate, Pb(CH3COO)₂

Observation when Pb2+ is added to OH-

White ppt

Observation for when Pb2+ is added to excess OH-

White precipitate dissolves to form a colourless solution [Pb(OH)4]^2- tetrahydroxyplumbate ions formed

Observations for when Pb2+ is added to Cl-

heavy white ppt

Observations when Pb2+ is added to I-

Canary yellow ppt