An acid that ionizes completely in aqueous solution
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Strong acid definition
Strong acid
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HClO3
Soluble impurities disrupt consistency and organization of crystalline structure
Non uniform melting behavior
Molecules close to impurities melt first
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Why impure melt over a temperature RANGE?
A large Kb value indicates a strong base because it means the base is largely
dissociated into its ions.
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Large Kb means
Weak base
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NH4OH
Acid that does not dissociate completely in water
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Weak acid definition
When soluble impurities and reaction by-products have similar solubility properties as
desired product
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When is recrystallization difficult
Made of 2 mutually miscible liquids (polarity matches)
One of the solvents will dissolve product more readily than the other
One must have high solubility for compound at ALL temp
Other must have low solubility for compound at ALL temp
Dissolve impurities at all temp
Neither should react w product
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Mixed solvent system requires that:
End point very close to the equivalence point pH
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Choosing correct acid-base indicator
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Strong acid definition
Strong acid
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HClO3
Soluble impurities disrupt consistency and organization of crystalline structure
Non uniform melting behavior
Molecules close to impurities melt first
Give this one a try later!
Why impure melt over a temperature RANGE?
A large Kb value indicates a strong base because it means the base is largely
dissociated into its ions.
Give this one a try later!
Large Kb means
Weak base
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NH4OH
Acid that does not dissociate completely in water
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Weak acid definition
When soluble impurities and reaction by-products have similar solubility properties as
desired product
Give this one a try later!
When is recrystallization difficult
Made of 2 mutually miscible liquids (polarity matches)
One of the solvents will dissolve product more readily than the other
One must have high solubility for compound at ALL temp
Other must have low solubility for compound at ALL temp
Dissolve impurities at all temp
Neither should react w product
Give this one a try later!
Mixed solvent system requires that:
End point very close to the equivalence point pH
Give this one a try later!
Choosing correct acid-base indicator
