Chemistry Lab
TITLE: THE EFFECT OF HEATING DIFFERENT SUBSTANCES
INTRODUCTION: In this exercise, it was required to observe carefully what happened when certain substances were heated in a burner, and to note the appearance of the residue after heating.
AIM: To observe the effects of heating different substances.
MATERIALS:
Hard glass test tubes
Powered samples of
Lead (II) nitrate
Copper (II) sulphate
Ammonium chloride
Zinc sulphate
Basic copper (II) carbonate, CuCO3. Cu(OH)2
Blue and red litmus and a splint
METHOD:
1. About 1g of the solid was placed in a dry test tube and the test tube and its contents was heated in a burner, gently at first the strongly. During the heating the test tube was sloping slightly downwards.
2. Gases were tested and evolved with moist blue and red litmus and with a glowing splint
3. The results were tabulated noting carefully all that happens to the compound when it is heated and whether any color changes occur on heating
RESULTS: Substance heated Observation made
On heating Effect of gases evolved Blue litmus Red litmus Glowing splint
Copper (II) sulphate
Lead (II) nitrate
Ammonium chloride
Zinc sulphate
Basic copper (II) carbonate Change from blue to white
Water droplets formed
Changes from white to orange
Bubbled before turning to a gas
No color change
Powder hardened
Bubbled while heating
No color change
Changed from green to black
Crystals floated upon heating Yes
Yes
Yes
Yes
Yes No change
No change
No change
No change
No change No change
Yes
No change
No change
No change DISSCUSION: The solids that underwent color change upon heating include cupric carbonate, copper (II) sulphate and lead (II) nitrate. The solids that evolved water vapor upon heating was cupric carbonate and copper (II) sulphate the was proven by the formation of water
INTRODUCTION: In this exercise, it was required to observe carefully what happened when certain substances were heated in a burner, and to note the appearance of the residue after heating.
AIM: To observe the effects of heating different substances.
MATERIALS:
Hard glass test tubes
Powered samples of
Lead (II) nitrate
Copper (II) sulphate
Ammonium chloride
Zinc sulphate
Basic copper (II) carbonate, CuCO3. Cu(OH)2
Blue and red litmus and a splint
METHOD:
1. About 1g of the solid was placed in a dry test tube and the test tube and its contents was heated in a burner, gently at first the strongly. During the heating the test tube was sloping slightly downwards.
2. Gases were tested and evolved with moist blue and red litmus and with a glowing splint
3. The results were tabulated noting carefully all that happens to the compound when it is heated and whether any color changes occur on heating
RESULTS: Substance heated Observation made
On heating Effect of gases evolved Blue litmus Red litmus Glowing splint
Copper (II) sulphate
Lead (II) nitrate
Ammonium chloride
Zinc sulphate
Basic copper (II) carbonate Change from blue to white
Water droplets formed
Changes from white to orange
Bubbled before turning to a gas
No color change
Powder hardened
Bubbled while heating
No color change
Changed from green to black
Crystals floated upon heating Yes
Yes
Yes
Yes
Yes No change
No change
No change
No change
No change No change
Yes
No change
No change
No change DISSCUSION: The solids that underwent color change upon heating include cupric carbonate, copper (II) sulphate and lead (II) nitrate. The solids that evolved water vapor upon heating was cupric carbonate and copper (II) sulphate the was proven by the formation of water