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Separation Techniques

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Limin Koh

on 16 January 2013

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Transcript of Separation Techniques

Separation Techniques How do I separate mixtures into its constituents>? How do I obtain a dry sample of a solid solute that decomposes on heating? Sublimation Task 5, Pg 12-13 Note-taking One last thing about crystallisation Why do pure crystals form when hot saturated solution is cooled? How does the rate of cooling affect crystallisation? What is crystallisation? Filtration Have I obtained pure and dry sodium chloride? What kind of mixture does filtration separate? How do I separate a sand and salt mixture to obtain a pure and dry sample of each? Note-taking How do I separate a solid solute from its solution in a solvent? Do Task 6 on Pg 15-16 to find out Task 3, Pg 9.
Plan an experiment to find out Pg 25, Qn 13 Do you remember what 'SUBLIMES' mean?
What are some substances that sublime? Is your ' Methods of Separation' table completed? Before we start, I would like you to tell me... What do you know about mixtures? What do you understand by the term 'chemically combined'? Pure substances under the microscope NaCl SiO 2 Mixtures can be separated by Physical Methods Do not require high amount of energy e.g. high temperatures or electricity Why do we want to separate mixtures? How it works: Solution = Liquid Note-taking What is a saturated solution? Crystallisation procedure Pg 11. Task 4

Additional info:
Blue vitriol decomposes on heating Try it! Note-taking Note-taking:
Principle underlying crystallisation How do you know that the substances you separated are pure?

Is there a way to test purity? Task 7, Pg 17 - 19 Note-taking 1. On Definitions Page, define
'endothermic' and 'exothermic' 2. Purity of substance
Explain how the purity of a (i) solid, (ii) liquid can be tested. Pg 24 onwards. Qn 9, 15, 16, 17 Try it Distillation What would be one good reason to use distillation to separate NaCl(aq)? Task 1 - Pg 30 Task 2 - Pg 31 Can distillation separate two liquids? Note-taking
(cont. with table)
+ Draw set-up Pg 46 onwards,
Qn 1, 2, 6, 10, 11 Try it! Method 1 Method 2 1 2 3 1 2 3 What's wrong with these sublimation set-ups? What is going on here? Do
you
understand
now? Why is distillation not the best method to obtain NaCl(s) from NaCl(aq)? What are the changes of states that happen during distillation?

Where do they occur? What if.... Will distillation still occur? Hot water is used in the condenser instead of cold water What if..... Will distillation still occur? The water inlet/outlet positions are switched What if... Will distillation still occur? There was no thermometer in the set-up
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