Experoments

Question 1

Detect presence of chloride ions in aqueous solutions

Answer 1

Add silver nitrate

And a white precipitation forms

Question 2

Detect sulfate and sulfite

And to distinguish between them

Answer 2

Add barium chloride

White precipitation is formed

Distinguish
Then add HCl
•white precipitation remains in sulfate
•white precipitation goes in sulfite

Question 3

Detect carbonate ion and hydrocarbons the ions in aqueous solutions

And distinguish between the two

Answer 3

Add dilute HCl and CO2 is formed

This makes limewater milky

Distinguish:

Add magnesium sulfate (MgSO4)

• white precipitation in carbonate
• no white precipitation in hydrocarbonate

Question 4

Detect nitrate

Answer 4

Brown ring test

Nitrate salt is added in deionized water and then iron sulfate is added

Using a dropper add sulfuric acid H2SO4
At an angle making is do down into the bottom of the testtube

A brown ring is formed

Question 5

Detect phosphate

Answer 5

Phosphate salt is dissolved in deionised water

Ammonium molydate is added

With a dropper add nitric acid and place in warm water

A yellow precipitation is formed

Question 6

Radioactivity

Answer 6

Spontaneous breaking up of a unstable nuclei with the emission of one or more types of radiation