Purity, formulations and chromatography (paper 2)
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Last updated 9:15 PM on 2/23/23
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12 Terms
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How is purity worked out?
By looking at the melting or boiling points of samples, closer value = the purer the substance
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Examples of pure substances?
1. Water
2. Oxygen
3. Copper sulfate
4. Sodium chloride
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How do impurities affect the melting point of a sample?
They decrease it
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How do impurities affect the boiling points of samples?
They increase it
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What is chromatography?
It’s a process that separates a mixture into its different components
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What is the mobile phase?
Liquid or gas
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What is the stationary phase?
Solid or viscous liquid
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How do we know if a substance is more attracted to the mobile phase (liquid or gas)?
Substance will move far
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How do we know if a substance is more attracted to the stationary phase (solid or viscous liquid)?
Substance doesn’t move far
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Why can the number of spots of a mixture vary?
Depends on the solvent being used
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What’s a reference substance?
A pure substance that’s run next to the tested substance to see if its a component in the mixture
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How many chromatography spots are produced by pure samples, and why?
* pure substances consist of a single element or compound
* They will only produce 1 spot
* They will only produce 1 spot
Note 
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