Test Anions And Gases

Question 1

Test for carbonate

Answer 1

Add dilute HCl to the solid (or mi with solution). Bubbles of CO2 gas are given off. If the gas is bubbled into limewater, it turns milky.
CO3^2-(aq) + 2H+(aq) -> CO2(g) + H20(l)
Ca(OH)2(aq) + CO2(g) -> CaCO3(s) + H20(l)

Question 2

Test for Chloride

Answer 2

add a few drops of nitric acid and then a few drops of aqueous silver nitrate solution. A white precipitate of silver chloride is formed.
Ag+(aq) + Cl-(aq) -> AgCl(s)

Question 3

Test for Iodide

Answer 3

add a few drops of nitric acid and then a few drops of a aqueous silver nitrate solution. A pale yellow precipitate of silver iodide is formed.

Ag+(aq) + I-(aq) -> AgI(s)

Question 4

Test for nitrate

Answer 4

boil with aluminium and sodium hydroxide solution, carefully, and when the pungent smelling ammonia gas (formed by the reduction of the nitrate ion by the aluminium) is tested with damp red litmus paper it turns blue.

Question 5

Test for sulfate

Answer 5

Add a few drops of nitric acid than a few drops of barium nitrate solution. A white precipitate of barium sulfate is formed.

Ba^2+(aq) + SO4^2-(aq) -> BaSO4(s)

Question 6

Test for ammonia

Answer 6

Damp red litmus paper is turned blue.

Question 7

Test for CO2

Answer 7

A gas is produced, which when bubbled in limewater, turns milky.

Question 8

Test for Chlorine

Answer 8

Damn blue litmus paper is reddend then bleached.

Question 9

Test for Hydrogen

Answer 9

A lighted splint is brought up the tube. A Pop or squeak denotes hydrogen.

Question 10

test for oxygen

Answer 10

A glowing splint is relighted

Question 11

Test for sulfur dioxide

Answer 11

Turns aqueous potassium manganate (VII) from purple to colourless.