Unknown identification number 23 cations found

Unknown identification number- 23
Cations found- mercury, lead (II)
Present evidence proving the presence of listed cations
1. Filtrate is colorless initially after adding chromate it turned a white cloudy yellow with
some residue confirming presence of lead
2. Residue was a white powder and after adding NH3 it turned black confirming presence of
Mercury.
3. Filtrate 2 was at first colorless, after adding nitric acid to the ammonia filtrate it gave off
a white smoke but remained colorless after, this means no silver is present.

Post Lab Questions
1. One way to perform this experiment a little bit more accurately would be to cool the
liquid at a slower pace and measure the temperature a tad bit more accurately. One way to
do this would be by putting a lid over the beaker. The lid over the beaker can make sure
the heat leaves the beaker at a slower pace. Another change we could make to this
experiment would be to use a Styrofoam cup which would help keep the heat in the
beaker and in a more controlled environment.
2. 79.46 degrees Celsius kg/mol