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Description
Flashcards by josephw weetch, updated more than 1 year ago
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Created by josephw weetch
about 6 years ago
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| Question | Answer |
| Why is this necessary? | Because there may still be some water left in the organic product. |
| What is a drying agent? | An anhydrous inorganic salt that readily takes up water to become hydrated |
| Drying agent for drying hydrocarbons? | CaCl2 |
| General drying agents | CaSO4 MgSO4 |
| Step 1. | Add organic liquid to a conical flask. |
| Step 2. | Using a spatula add some of the drying agent to the liquid and gently swirl the contents to mix together. |
| Step 3. | Place a stopper on the flask to prevent product from evaporating away. Leave for 10 minutes. |
| Step 4. | If solid has clumped, then there is still some water present. Add more drying agent until solid is dispersed in solution as a fine powder. |
| If liquid is clear upon decanting what does this indicate? | That the liquid is dry |
| When is redistillation necessary? | If organic liquids have bpt similar then sample may still contain some organic impurities. |
| Step 1. | Clean out distillation apparatus and set up to carry out a second distillation |
| Step 2. | Carry out second distillation, using a narrow boiling range that matches the boiling point of the compound of interest. |
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