Practicals Flashcards by caitlin rombouts

Q

[Practical 10]

In recrystallisation, why do you dissolve crystals in the minimum amount of hot water

A

to ensure the solution formed is saturated

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Q

[Practical 10]

In recrystallisation why is the solution filtered through a hot filter funnel

A

To remove any insoluble impurities

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Q

[Practical 10]

Why is the conical flask left to cool to room temperature to allow crystals to reform?

A

yield would be lower if it is too warm as solubility is higher at a higher temperature

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Q

[Practical 10]

Why are crystals filtered under pressure using a Büchner funnel?

A

allows for better drying, air passes through crystals not around them

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Q

[Practical 10]

Why is cold water poured through the crystals?

A

To wash away soluble impurities

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