Practicals
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Describe the process of preparing a pure organic solid (e.g. aspirin)
• dissolve the impure sample in a minimal volume of hot solvent • filter hot solution through filter paper • cool the filtrate by inserting beaker into ice • filter under reduced pressure • wash the crystals with cool solvent
When preparing a pure organic solid, why wash the crystals in cold solvent?
remove soluble impurities
When preparing a pure organic solid, why use a minimal volume of hot solvent?
hot to dissolve the compound and impurities, minimal volume required to get a concentrated solution so solution is saturated
When preparing a pure organic solid, why filter the hot solution through filter paper?
remove insoluble impurities