![]() |
Creado por josephw weetch
hace alrededor de 6 años
|
|
Pregunta | Respuesta |
When is refluxed used? | To prepare an organic liquid without boiling off the solvent, reactants or products. |
What temperature does refluxing boil solutions at? | A fixed temperature |
Draw a diagram of the apparatus used | stand and clamp pear-shaped flask condensor rubber tubing heat source |
Step 1. | Assemble apparatus |
Step 2 | Add anti-bumping granules to liquid ensure smooth boiling |
When are anti-bumping granules added? | Before condensor is fitted and before liqiud is boiled |
Why? | Enables a liquid to be continually boiled whilst a reaction is taking place Prevents glassware vibrating |
Step 3. | Apply thin layer grease to ground-glass joint of condenser |
Step 4. | Place condenser carefully into flask and gently rotate condenser back and forth to provide a good seal |
Step 5. | Condenser is kept in upright position and clamped loosely as the glass outer jacket is fragile |
Why should you never put a stopper in the condenser? | As you would have a closed system and pressure would build up inside as heated air is expanded. |
Purpose of rubber tubing | Connect inlet of condensor to tap and outlet to sink. |
Where does water always enter the condenser? | At the bottom and leaves at the top |
What is the role of the condenser in the reflux reaction | Ensures any vapour produced from reaction condenses and drips back into the flask. |
What heat source may be used if the reaction is carried out under 100'c? | Water bath. |
¿Quieres crear tus propias Fichas gratiscon GoConqr? Más información.