8 drops

NaF NaCl NaBr NaI

Now add calcium nitrate to each tube

Added calcium nitrate to each tube.

NaF NaCl NaBr NaI

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!

NaI NaBr NaClNaF

Now add silver nitrate to each tube

Added silver nitrate to each tube

NaI NaBr NaCl NaF

What could be causing the precipitate in the tubes?

NaClNaBrNaI

Added silver nitrate

NaCl + silver nitrate = precipitateNaBr + silver nitrate = precipitateNaI + silver nitrate = precipitate

NaCl + silver nitrate = sodium nitrate + silver chlorideWhich one is the precipitate?

Look at your solubility chart>

Group I has weak attractionto every – ion; Nitrate has weakattraction to every + ion

Silver has strong attraction toiodine, bromine and chlorine ions.

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.

1.

2. Now add sodium thiosulfate to each tube.

2.

I Br Cl F Dissolved

Dissolved

I Br Cl F

I Br Cl F

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.