6 Predict the effect of adding the sodium sulfide solution before adding the sodium iodide solution. Pot Silver Reactions Watch the movies and record the colors of each mixture and whether a precipitate is present. 6 Predict the effect of adding the sodium sulfide solution before adding the sodium iodide solution. Go to Top Teachers Guide Purpose To illustrate that some reactions near completion more than others. Top Lab Hint Mixing the solutions out of order ruins the demonstration.
Silver nitrate is expensive.
The reactions may be accomplished with half of the recommended volumes in circumstances where all students will still be able to see clearly. You may wish to make a transparency of the equilibrium data handout and display on the overhead during the demonstration or during discussion after the demonstration. The sulfide fumes and ammonia fumes are toxic. Silver nitrate causes black stains on skin. Go to Top Precautions Store sulfide and ammonia solutions under hood until just before use.