Presentation on theme: "8 drops NaF NaClNaBrNaI Now add calcium nitrate to each tube."— Presentation transcript:
NaF NaClNaBrNaI Now add calcium nitrate to each tube
Added calcium nitrate to each tube. NaFNaClNaBr 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!
NaINaBr NaCl NaF Now add silver nitrate to each tube
Added silver nitrate to each tube NaINaBr NaClNaF
What could be causing the precipitate in the tubes? NaClNaBr NaI Added silver nitrate NaCl + silver nitrate = precipitate NaBr + silver nitrate = precipitate NaI + silver nitrate = precipitate NaCl + silver nitrate = sodium nitrate + silver chloride Which one is the precipitate? Look at your solubility chart> 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.
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 Now add sodium thiosulfate to each tube. 2. I Br Cl F Dissolved I Br Cl F
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.