ALL CHEMISTRY TESTS

Question 1

All Flame Test Colours

Answer 1

Lithium- Red
Sodium- Yellow
Potassium - Lilac
Calcium- Brick-red
Magnesium - Bright White
Barium- Pale Green
Copper- Blue-green

Steps:
Take platinium/ nichrome and dip in hydrochloric acid.
Hold over roaring and luminous bunsen flame until no color change occurs.
Dip in sample and hold over non- roaring , non- luminous bunsen flame.

Question 2

All Flame Test Colours

Answer 2

Lithium- Red
Sodium- Yellow
Potassium - Lilac
Calcium- Brick-red
Magnesium - Bright White
Barium- Pale Green
Copper- Blue-green

Steps:
Take platinium/ nichrome and dip in hydrochloric acid.
Hold over roaring and luminous bunsen flame until no color change occurs.
Dip in sample and hold over non- roaring , non- luminous bunsen flame.

Question 3

Cation Tests

Answer 3

Cations are identified by Sodium Hydroxide :
Copper 2 produces a blue ppt.
Iron 2 produces a green ppt.
Iron 3 prodcues a brown ppt.

Ammonium Ions produce ammonia gas when mixed with sodium hydroxide.

Question 4

Anion Tests

Answer 4

To aqueous solution of solid under test add few drops of nitric acid followed by few drops of barium nitrate. Chlorides produce white color, Bromide produces Creamy color, Iodide produces yellow.

For Nitrate : Add Sodium Hydroxide and aluminium foil and warm gently , if positive then ammonia will will be produced.

Question 5

Sulfate Ions Test

Answer 5

Add few drops of dilute hydrocholric acid to aqueous solution of solid under test followed by few drops of barium chloride. White ppt of barium sulfate.

Question 6

Carbonate Ions Test

Answer 6

Add dilute hydrochloric acid or nitric acid to solid or aqueous solution under test and gas produced will turn limewater milky.