To prepare sulphur dioxide gas in the laboratory Std 8 to 12 Science practical.

Preparation of Sulphur Dioxide in Laboratory

To prepare sulphur dioxide gas in the laboratory. 

AIM :  To prepare sulphur dioxide gas in the laboratory and study its properties.

It is known from the properties of sulphur dioxide that it is extremely pungent smelling colourless bacteriostatic gas. Excess of sulphur dioxide in the air causes air pollution. When it escapes from engine exhaust and factory  chimneys it causes pollution. It is suffocating and leads respiratory inflammation. For this reason it is necessary to reduce  its proportion from the air.

THEORY :  Copper metal and concentrated sulphuric acid reacts to give corresponding  acid salt ( copper sulphate ) and sulphur dioxide gas.

APPARATUS  : Round bottom flask, thistle funnel, delivery tube, four to five gas jars, stand, two-holed cork, lid, wire gauze, tripod stand, etc.

CHEMICALS  : Copper metal, Sulphuric acid, red and blue litmus papers, wax, potassium permanganate, magnesium strip etc.

Preparation of Sulphur dioxide in Laboratory

Observation :- 

Physical properties :

1. Colour of sulphur dioxide gas :
2.  Odour or small of sulphur dioxide gas:
3.  Solubility of the gas in water :
4.  During the experiment this gas is collected by the upward displacement of air, therefore this gas is                    than air.

Chemical properties :

1. When red and blue litmus papers are inserted in gas jar containing sulphur dioxide.
2.  When an ignited magnesium ribbon is held in a gas jar containing sulphur dioxide.
3.  When potassium permanganate solution is added to the gas jar containing sulphur dioxide.
4.  Give the chemical reaction, which is used to prepare sulphur dioxide in laboratory.

CONCLUSION :-

PRACTICAL USES

It is known from the properties of sulphur dioxide that it is extremely pungent smelling colourless bacteriostatic gas. Excess of sulphur dioxide in the air causes air pollution. When it escapes from engine exhaust and factory  chimneys it causes pollution. It is suffocating and leads respiratory inflammation. For this reason it is necessary to reduce  its proportion from the air.

For more details View Video:

To prepare sulphur dioxide gas in the laboratory. 

To test the presence of Carbon monoxide and Sulphur dioxide in the atmosphere. Biology std 11 & 12

To test the presence of Carbon monoxide and Sulphur dioxide in the atmosphere.

Test of Carbon  and Sulphur dioxide

INSTRUMENTS
Filter paper,  
Palladium or Platinum chloride, Acidic potasium dichromate.
Test for Carbon monoxide
Filter paper deep in chemical
Keep where transportation is more and smoke of automobiles is very high
View the changes on filter paper.
Slowly slowly it gets change in colour.
After some times 
Finally you see the change in colour that is due to Carbon monoxide is presence in Air.

Test for Sulphur dioxide
Filter paper deep in chemical
Keep where transportation is more and smoke of automobiles is very high
View the changes on filter paper.
Slowly slowly it gets change in colour.
After some times 

Finally you see the change in colour that is due to Sulphur dioxide  is presence in Air.

For more details view Video

To test the presence of Carbon monoxide and Sulphur dioxide in the atmosphere.

Angle of deviation of GLASS PRISM, GBSE practical for std 11 & 12.

Angle of Deviation of Glass Prism

ANGLE OF DEVIATION OF GLASS PRISM, 

12.1  AIM :-

Determine with the help of pins, the angle of the given glass prism. Determine the values of angle of emergence and angle of deviation for four different values of angle of incidence. Hence prove that  i + e = A +d.

PRINCIPLE : Reflection and refraction of light.

APPARATUS:  Glass Prism, Drawing paper, Drawing board, Pencil, Ruler, Pin, Protector,

PRECAUTIONS

Ø    While marking the position of a prism with pencil, the prism should not be disturbed.

Ø   A prism should be carefully put back exactly at the marked position.

Ø    While pressing the heads of the pins for fixing them use metal coin or a hard object so that you do not hurt your palm.

Ø    Do not press the pins very hard in the board otherwise it becomes difficult to remove them afterwards.

Ø   See that the pins pushed in the board remain perpendicular to the board.

PROCEDURE :

Take paper and pin it on Drawing board. 

Now take Glass prism and put it on center of Drawing board paper.

Mark the edges of the prism with pencil.

Angle of Deviation of Glass Prism Practical

Draw line P₁ M perpendicular  to prism base BC.

Insert two pins vertically P₁ & P_2..

Place the Prism on its original position.

NOTE :- Pins should be 3 – 4 cm. away from each other.

Observe pins from the side AB and insert two pins P’₁ & P’₂ such that images of P₁ ,P₂ and pins P’₁ & P’₂ are collinear.

Angle of Deviation of Glass Prism Procedure

Draw line Q₁ N perpendicular  to prism base BC

Insert two pins verticallyQ₁ & Q_2.

Angle of Deviation of Glass Prism Procedure

Place the prism on its original position

Observe pins from the side AC and insert two pins Q’₁ & Q’₂ such that images of Q₁ ,Q₂ and pins Q’₁ & Q’₂ are collinear.

Angle of Deviation of Glass Prism Procedure

Measure angle with protector ÐP’₁OQ’_1.

Angle of PRISM = ÐP’₁OQ’₁  / 2.

Angle of Deviation of Glass Prism Procedure

For more details view Video

Angle of Prism:

Beautiful Quantum chemistry pictures and its drawings for std 11 & 12 GSEB

Innovative Technique of chemistry

Beautiful Picture of Quantum Chemistry

Photo Electric effect

Absorption spectra

Absorption spectrum

Absorption Spectrum of Barium

Electromagnetic Spectrum

Continuous Emission of  Spectrum

Emission of Spectra

Emission spectrum of Barium

Emission Spectrum

Emission spectra of Elements

Emission

Photo electric Effect Machine

Spectrum of Hydrogen

Photo electric effect

Hydrogen spectrum series

Prism Output

Bhor's Model

Deflection of Alpha Particles

Bhors orbit

Rutherfords model

S - Orbitals

Shapes of D orbitals

Shapes of D orbitals 2

P - Orbitals

Shapes of P - Orbitals -2

Shapes of P -Orbitals 1

Scattering Experiments

Neclueus  and Energy

Neucleus

Neucleus & Energy Value

Atomic Orbitals

Sub Shell and  Orbitals