Draw three repeating units of the condensation polymer made from ethanedioic acid and ethanediol.
To draw the repeating unit of the condensation polymer made from ethanedioic acid (also known as oxalic acid) and ethanediol (also known as ethylene glycol), follow these steps:
Step 1: Draw the structure of ethanedioic acid:
O H O
|| | ||
H-C-C-C-C-C-H
|| | ||
O H O
Step 2: Draw the structure of ethanediol:
H H H
| | |
H-O-C-C-O-H
| | |
H H H
Step 3: Identify the functional groups on ethanedioic acid and ethanediol that react to form the polymer. In this case, it is the carboxylic acid group (-COOH) on ethanedioic acid and the hydroxyl group (-OH) on ethanediol.
Step 4: To form the repeating unit, remove the water molecule (H2O) from the acid and alcohol functional groups. This elimination reaction is part of the condensation polymerization process. One hydroxyl group from ethanediol reacts with one carboxylic acid group from ethanedioic acid, resulting in the formation of an ester linkage (-CO-O-) and the release of a water molecule.
Step 5: Combine the resulting structures after the elimination reaction to form the repeating unit:
O H
|| |
H-C-C-CO-O-C-H
|| |
O H
Step 6: Repeat the repeating unit three times to form the polymer chain:
O H O H O H
|| | || | || |
H-C-C-CO-O-C-H H-C-C-CO-O-C-H H-C-C-CO-O-C-H
|| | || | || |
O H O H O H
These are three repeating units of the condensation polymer formed from ethanedioic acid and ethanediol.
To draw the repeating units of the condensation polymer made from ethanedioic acid (also known as oxalic acid) and ethanediol (also known as ethylene glycol), you need to understand the structure of each of these monomers.
The chemical formula for ethanedioic acid is (COOH)₂. It contains two carboxyl (-COOH) groups. The structure can be represented as:
HOOC-COOH
The chemical formula for ethanediol is HO-CH₂-CH₂-OH. It contains two hydroxyl (-OH) groups. The structure can be represented as:
HO-CH₂-CH₂-OH
To form the repeating unit of the condensation polymer, we will remove water (H₂O) from the acid and the alcohol. This process is called a condensation reaction. The reaction can be represented as follows, where the water molecule is eliminated:
HOOC-COOH + HO-CH₂-CH₂-OH → HOOC-(-O-CH₂-CH₂-O-)-COOH + H₂O
The resulting repeating unit of the condensation polymer formed from ethanedioic acid and ethanediol would look like:
HOOC-(-O-CH₂-CH₂-O-)-COOH
To draw the repeating units of the polymer, you can repeat this structure three times:
HOOC-(-O-CH₂-CH₂-O-)-COOH
HOOC-(-O-CH₂-CH₂-O-)-COOH
HOOC-(-O-CH₂-CH₂-O-)-COOH
These repeating units are connected via ester linkages, which are formed during the condensation reaction. Note that the actual polymer structure can be much longer, with many repeating units. This is just a representation of three repeating units for visualization purposes.