Why are you required to flame-dry your glassware for this week's experiment? (2 Marks) What is...

Why are you required to flame-dry your glassware for this week's experiment?

What is the purpose of: a) washing with brine and b) adding sodium sulfate?

Expert Solution

Why are you required to flame-dry your glassware for this week's experiment?

Most of the raections are moisture sensitive and requires absolutely dry environment for better result. The environment contains about 1.04% of moisture which can stick to the surface of the glassware. To remove this residual moisture from the flask, it is generally heated before the reaction starts and it is advisable to do this operation under enert atmosphere.

What is the purpose of: a) washing with brine and b) adding sodium sulfate?

(a)

During extraction process, when liquid liquid extraction is done, there would be some carried over from one phase to the other. Brine is a saturated solution of sodium chloride and can act as dehydrating agent to remove any water droplelts mixed in the organic phase. It clears residul water, as well as other inorganic emulsion.

(b)

Anhydrous sodium sulfate is also used to dry the organic extract after separation. There would be some moisture dispersed in the organic layers which can be taken away after shaking the extract sodium sulfate.

queen_honey_blossom answered 2 years ago

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