4. When Fe(NO3)3 is added to water, the following dissociation reaction occurs:
Fe(NO3)3 →
Fe3+ + 3 NO3
The Fe3+ is able to move freely through the H2O2 solution and catalyze the decomposition reaction.
Similarly, when Na3PO4 is added to water the following dissociation reaction occurs:
Na3PO4 → 3 Na+ + PO-.
When Fe3+ is combined with POS, an insoluble precipitate of FePO4(s) forms:
Fe3+ + POS- →
FePO4(s).
Why is Na3POs expected to act as an inhibitor for the catalyzed decomposition of H2O2 by Fe3+?

The density would be 1.622

Change in speed or direction : )

Sink to the bottom. addition of potassium nitrate past it’s dissolution capacity at a particular temperature will cause the extra to just sink to the bottom of the glass.however, if you were to raise the temperature of the solution prior to dissolving it, and then slowly decrease the temperature after the dissolution, you would create a “supersaturated” solution - a solution that has more solute dissolved into it than should be allowed. if you add any extra solute past this, the entire solution would “crystallize,” and this is how you get those cool videos on youtube.