Halogen ion lab

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Halogen ion lab
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8 drops
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First reaction
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NaF
NaCl
NaBr
NaI
Now add calcium nitrate to each tube
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NaF
NaCl
NaBr
NaI
Added calcium nitrate to each tube.
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Calcium nitrate sodium fluoride a
precipitate
What could it be? Calcium
nitrate NaF calcium fluoride sodium
nitrate
which is the precipitate??? Now
balance the equation!
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Second Reaction
8
NaI
NaBr
NaCl
NaF
Now add silver nitrate to each tube
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NaCl
NaF
NaI
NaBr
Added silver nitrate to each tube
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What could be causing the precipitate in the
tubes?
Added silver nitrate
Group I has weak attraction to every ion
Nitrate has weak attraction to every ion
Silver has strong attraction to iodine, bromine
and chlorine ions.
NaI
NaCl
NaBr
NaCl silver nitrate precipitate NaBr silver
nitrate precipitate NaI silver nitrate
precipitate NaCl silver nitrate sodium
nitrate silver chloride
Look at your solubility chartgt
Which one is the precipitate?
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Another reaction
1st add ammonium hydroxide to each of the tubes
containing precipitates, then later add sodium
thiosulfate to each one
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I Br Cl F
Dissolved
I Br Cl F
1.
2.
1. Now add ammonium hydroxide to each tube.
I Br Cl F
2. Now add sodium thiosulfate to each
tube.
Dissolved
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AgCl ammonium hydroxide precipitate
dissolves. AgBr sodium thiosulfate
precipitate dissolves AgI doesnt dissolve with
either solution. You can try to predict what the
balanced equations might be. If you read the lab
and look carefully you can write balanced
equation for the reaction where AgCl dissolves
and AgBr dissolves. However this is not
absolutely required in the lab.