preparation of formaldehyde resign
Aim preparation of polymer (urea formaldehyde resign)Principles:_____preparation of resign involves condensation reaction between urea and formaldehyde in presence of an acid catalyst
>>chemical required :------ FORMALDEHYDE SOLUTION, UREA, CONCENTRATED H2SO4
1. PLACE 20 ML OF FORMALDEHYDE SOLUTION IN A 100 ML BEAKER
2.ADD ABOUT 10g OF UREA WHITE STRING UNTIL A SATURATED SOLUTION IS OBTAINED
3.ADD FEW DROPS OF CONCENTRATED H2SO4 STRING COUNTUNESSLY DURING THE ADDITION
4.A SUDDEN VOLUMINOUS WHITE SOLID MASS APPEARS IN BEAKER
5.WHEN THE SOLUTION IS COMPLETE WASH RESIDUE WITH H20 AND DRY THE PRODUCT
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