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Halogen ion lab

Halogen ion lab. 8 drops. First reaction. NaF. NaCl. NaBr. NaI. Now add calcium nitrate to each tube. NaF. NaCl. NaBr. NaI. Added calcium nitrate to each tube. Calcium nitrate + sodium fluoride = a precipitate

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Halogen ion lab

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  1. Halogen ion lab

  2. 8 drops

  3. First reaction

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

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

  6. 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!

  7. Second Reaction

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

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

  10. 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?

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

  12. 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

  13. 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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