# Halogen ion lab.

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Halogen ion lab

8 drops

First reaction

Now add calcium nitrate to each tube
NaF NaCl NaBr NaI Now add calcium nitrate to each tube

Added calcium nitrate to each tube.
NaF NaCl NaBr NaI Added calcium nitrate to each tube.

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!

Second Reaction

Now add silver nitrate to each tube
NaI NaBr NaCl NaF Now add silver nitrate to each tube

Added silver nitrate to each tube
NaCl NaF NaI NaBr Added silver nitrate to each tube

NaCl + silver nitrate = sodium nitrate + silver chloride
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 NaBr NaCl NaCl + silver nitrate = precipitate NaBr + silver nitrate = precipitate NaI + silver nitrate = precipitate NaCl + silver nitrate = sodium nitrate + silver chloride Look at your solubility chart> Which one is the precipitate?

Another reaction 1st add ammonium hydroxide to each of the
tubes containing precipitates, then later add sodium thiosulfate to each one

1. Now add ammonium hydroxide to each tube. 2. Now add sodium
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

AgCl + ammonium hydroxide = precipitate dissolves….
AgBr + sodium thiosulfate = precipitate dissolves AgI doesn’t 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.

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