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Figure 3.1 - Apparatus for the production of ethine
(acetylene)

Water reacts with calcium carbide to form ethin,
which is discharged through a gas-fired tube:

C
Ca + H O H C C H + Ca(OH) 2
2
2
C

Ethyne, which is released as a result of the reaction, is
passed into a test tube with bromine water which is
discolored due to the addition of bromine in multiple bonds
with the formation of 1,2-dibromoethene and
tetrabromoethane by the equations of reactions:

C H C H + B r 2 C H C H

B r B r
1,2-dibromoethene