Saturday, May 11, 2019

PREPARATION OF IODOFORM FROM ETHANOL WITH MELTING POINT AND PURIFICATION WITH MELTING POINT AND PURIFICATION

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PREPARATION OF IODOFORM FROM ETHANOL





PREPARATION OF IODOFORM FROM ETHANOL WITH MELTING POINT AND PURIFICATION WITH MELTING POINT AND PURIFICATION
PREPARATION OF IODOFORM FROM ETHANOL WITH MELTING POINT AND PURIFICATION WITH MELTING POINT AND PURIFICATION 


REQUIREMENTS:

Apparatus:                                                                                     

Beakers, Funnel, Test tubes, Balance, Spatula, Water bath, Stirrer, Filter paper, etc

Chemicals:



                        Ethanol …………….………………………….. 20ml

                        Sodium carbonate …………………………….. 40gm

                        Iodine …………………………………………. 03gm

                        Distilled water ………………………...………… Q.S

THEORY:

Chemical Properties
yellow solid with a characteristic pungent.

General Description
Bright yellow or yellow powder or crystals. Penetrating odor. Unctuous touch.

Air & Water Reactions
Insoluble in water.

Reactivity:
Iodoform decomposes at high temperatures. Decomposes slowly in light at room temperature. Reacts violently with lithium. It is incompatible with mercuric oxide, calomel, silver nitrate, tannin, and balsam Peru. It is also incompatible with strong bases, strong oxidizing agents, and magnesium. Vigorous reactions occur with acetone in the presence of solid potassium hydroxide or calcium hydroxide, hexamethylenetetramine at 352° F, mercury(I) fluoride and finely divided reduced silver.

Fire Hazard
Literature sources indicate that Iodoform is nonflammable


PROCEDURE:

1)      Sodium carbonate was taken in a beaker and sufficient water was added to dissolve it completely. It was then filtered.

2)      Then I added ethanol in it and it was warmed at 70-80 oC in a water bath.

3)      Then iodine was added with continuous stirring until completely dissolved.

4)      The yellow precipitate was observed after some time.

5)       Filtered and thus obtained residue on the filter paper.

6)      Then I weighed and determined the percent (%) yield.



CALCULATIONS AND RESULT






     Reaction:

2C­­2H5OH + 8I2 + Na2CO3 + H2O ……………….. 2 CHI3 + 2HCOONa + CO2 + 10HI

ACTUAL YIELD OF IODOFORM
     
      Iodine:
Molecular weight of iodine =           gm
4 moles of iodine used =
                                     =                  gm
Mass of iodine taken =                    gm
    
   Iodoform:
Molecular weight of iodoform =               gm
1 mole of iodoform produced =               gm
Mass of iodoform obtained (Actual yield) =           gm

THEORETICAL YIELD OF IODOFORM

         gm of iodine produces =           gm of iodoform
         gm of iodine produces      =  ×
                                               
                                              =           gm of iodoform
So,
Percentage yield =  Actual yield  × 100
                             Theoretical yield
                            =          ×100
                                  
                            =              %



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