Core practical 6 - Chlorination of 2-methylpropan-2ol with conc HCl Flashcards
(10 cards)
What is the first step?
Pour the alcohol and the HCl into large conical flask and swirl gently - Safely mix the reactants and allow exothermic reaction to proceed without pressure build up
What is the second step?
Place bung into mouth of flask, swirl again remove bung to release pressure should be 2 layers - Trapping HCl vapour allow reaction to proceed then release pressure caused by gas build-up from exothermic reaction. Ensure complete reaction
What is third step?
Add 6g of powdered anhydrous calcium chloride to flask and stir till dissolves - This ensures any unreacted alcohol in lower layer
What is the fourth step?
Transfer reaction mixture into separating funnel. Allow mixture to settle run off and discard lower layer retain upper organic layer in separating funnel - Separate the organic product from the layer containing water
What is the 5th step?
Add sodium hydrogencarbonate solution to separating funnel. Swirl funnel to remove bung run off and discard lower aqueous level - Neutralise any unreacted HCl release CO2 gas to prevent pressure build up
What is the 6th step?
Repeat washing with sodium Hydrogencarbonate, shake the separating funnel and release CO2- Ensuring all HCl is completely neutralised
What is the 7th step?
Run off and discard lower layer ensure non of it remains in tap - Lower layer denser contains unwanted impurities must be discarded to isolate pure organic product
What is Step 8?
Add a spatula of anhydrous sodium sulfate. Place into bung and swirl the contents. Leave mixture until clear - Drying agent absorbs any remaining water in organic layer ensuring that it is dry.
What is the 9th step?
Decant the liquid into pear shaped flask - Allows for efficient distillation due to its shape promote even heating and easy collection of purified organic product
What is the 10th step?
Set up flask for distillation and collect fraction between 50 and 52 and place purified product into label test tube.
