Chemistry Inorganic and Organic Tests

What is the test for group 2 ions?

NaOH solution

What is the result of an NaOH solution test for group 2 ions?

White ppt

What is the test for group 7 (halide) ions?

Dilute acid
Silver nitrate solution

What are the different positive results for a halide ion test?

Chloride - white ppt

Bromide - cream ppt

Iodide - yellow ppt

How can you differentiate between chloride and bromide/iodide ions other than the ppt formed?

Dilute ammonia dissolves the chloride ppt

How can you differentiate between bromide and iodide ions other than the ppt formed?

Concentrated ammonia dissolves the bromide ppt

What is the test for ammonia ions?

NaOH solution (produces gas faster)

Shake tube + warm in water bath

Damp red litmus paper

What is the positive result for an ammonia ion test?

Red litmus paper turns blue

What is the test for hydroxide ions?

Damp red litmus paper
Or universal indicator

What is the positive result for a hydroxide ion test?

Litmus paper turns blue
Or indicator turns blue-purple

What is the test for a carbonate ions?

Dilute acid

What is the positive result of a carbonate ion test?

Effervescence

Releases CO₂ that can be tested for by limewater

What is the test for sulfate ions?

Dilute barium chloride

What is the positive result for a sulfate ion test?

White ppt

What colour flame do calcium ions make?

Brick red

What colour flame do strontium ions make?

Crimson / red

What colour flame do barium ions make?

Pale green