Unit 14D applied science complete
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Najah Bendriss BTEC Applied Science Chemistry Unit 14D
Preparation of 1-Bromobutane in the laboratory.
Aim:
To prepare 1-Bromobutane from butan-1ol and determine the yield and purity in the
laboratory.
Introduction:
1-bromobutane is a primary alkyl halide (primary alkyl) and therefore it is produced from
bimolecular nucleophilic substitution reactions. The boiling point of 1-bromobutane is
between 101.4 to 102.9 °C and it is a colourless liquid.
Hypothesis:
The product will be a colourless liquid.
Apparatus:
Pear shaped flask
Reflux condenser
Separating funnel,
NaBr
Distilled water
Concentrated H2SO4
Risk Assessment:
We had to carry out a risk assessment before starting the experiment.
RISK ASSESSMENT FORM
Name of assessor:
Henrietta Akinola
Date:
13.10.2020
Activity:
Preparation of 1-Bromobutane from butan-1ol and determine the yield and purity in
the laboratory.
Hazards:
Butan-1-ol, Sulphuric Acid, Sodium hydroxide, glass equipment e.g. pear shaped
flask.
1
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Najah Bendriss BTEC Applied Science Chemistry Unit 14D
Risk:
The hazards named are corrosive, harmful to skin and eyes, flammable.
Those at risk:
Students and teachers as we were all on close contact with the hazards.
Control measures/Safety precaution:
All students wore goggles and gloves to protect against harmful substances. All
students were careful when handling the glassware.
Training:
The teacher trained all the students to work safely with the hazards to avoid risks.
Emergency action:
If any of the hazards come into contact with skin wash area thoroughly.
Remaining risk:
After carrying out risk assessment there were no remaining risks.
Signature of assessor:
Method:
1. In a 50cm3 pear shaped flask, I placed 10grams of sodium bromide of NaBr; 10cm3 of
distilled water and 7.5cm3 of butan-1-ol (6grams).
2. I then fitted a flask to the reflux condenser and attached a funnel to the top.
3. I cooled the mixture in an ice bath and, slowly and with continuous stirring, added 10cm 3
of concentrated H2SO4. An ice bath and slow stirring are used because the hot acid causes
the oxidation of NaBr to Br2, useless in the experiment. The NaBr is dissolved during heating.
The acid is in a large excess to obtain a higher concentration of HBr.
2
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assignment
written by
najbo123
www.stuvia.com
Downloaded by: najbo123 | Want to earn £756
Distribution of this document is illegal extra per year?
, Stuvia.co.uk - The Marketplace for Revision Notes & Study Guides
Najah Bendriss BTEC Applied Science Chemistry Unit 14D
Preparation of 1-Bromobutane in the laboratory.
Aim:
To prepare 1-Bromobutane from butan-1ol and determine the yield and purity in the
laboratory.
Introduction:
1-bromobutane is a primary alkyl halide (primary alkyl) and therefore it is produced from
bimolecular nucleophilic substitution reactions. The boiling point of 1-bromobutane is
between 101.4 to 102.9 °C and it is a colourless liquid.
Hypothesis:
The product will be a colourless liquid.
Apparatus:
Pear shaped flask
Reflux condenser
Separating funnel,
NaBr
Distilled water
Concentrated H2SO4
Risk Assessment:
We had to carry out a risk assessment before starting the experiment.
RISK ASSESSMENT FORM
Name of assessor:
Henrietta Akinola
Date:
13.10.2020
Activity:
Preparation of 1-Bromobutane from butan-1ol and determine the yield and purity in
the laboratory.
Hazards:
Butan-1-ol, Sulphuric Acid, Sodium hydroxide, glass equipment e.g. pear shaped
flask.
1
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Distribution of this document is illegal extra per year?
, Stuvia.co.uk - The Marketplace for Revision Notes & Study Guides
Najah Bendriss BTEC Applied Science Chemistry Unit 14D
Risk:
The hazards named are corrosive, harmful to skin and eyes, flammable.
Those at risk:
Students and teachers as we were all on close contact with the hazards.
Control measures/Safety precaution:
All students wore goggles and gloves to protect against harmful substances. All
students were careful when handling the glassware.
Training:
The teacher trained all the students to work safely with the hazards to avoid risks.
Emergency action:
If any of the hazards come into contact with skin wash area thoroughly.
Remaining risk:
After carrying out risk assessment there were no remaining risks.
Signature of assessor:
Method:
1. In a 50cm3 pear shaped flask, I placed 10grams of sodium bromide of NaBr; 10cm3 of
distilled water and 7.5cm3 of butan-1-ol (6grams).
2. I then fitted a flask to the reflux condenser and attached a funnel to the top.
3. I cooled the mixture in an ice bath and, slowly and with continuous stirring, added 10cm 3
of concentrated H2SO4. An ice bath and slow stirring are used because the hot acid causes
the oxidation of NaBr to Br2, useless in the experiment. The NaBr is dissolved during heating.
The acid is in a large excess to obtain a higher concentration of HBr.
2
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