Chem 101
Lab 5: Names and Formulas
5th March 2022
*Note: I changed the color and capitalization to make it easier to read, hopefully.
Na2S
(S2-)
NaCl
(Cl-)
Na2SO4
(SO42-)
NaOH
(OH-)
𝐴𝑔+
𝑃𝑏 2+
Observation:
Solution
turned black
like tar
Name:
Silver Sulfide
Formula:
Ag₂S
Observation:
Solution
turned a
chalky white
and appears
powdery
Name:
Silver
Chloride
Formula:
AgCl
Observation:
NR, nothing
happened
Name:
Formula:
Observation:
Solution turned
black like motor
oil
Name:
Lead(II)Sulfide
Formula:
PbS
Observation:
Solution turned
chalky white and
powdery. Looks
the same as
AgCl
Name:
Lead(II)Chloride
Formula:
PbCl₂
Observation:
NR, no
reaction
Name:
Formula:
Observation:
Solution turned
chalky white and
powdery. Looks
the same as PbCl₂
and AgCl
Name:
Lead(II)Sulfate
Formula:
PbSO₄
Observation:
NR, no reaction
Name:
Formula:
Observation:
Solution
turned a
muddy brown
Name:
Silver Oxide
Formula:
Ag₂O
𝐶𝑎2+
𝐹𝑒 3+
𝐶𝑢2+
Observation:
Solution turned tarlike, similar to
Ag₂S.
Name:
Iron(II)Sulfide
Formula:
FeS
Observation:
NR, no reaction
Name:
Formula:
Observation:
Again, like Ag₂S and
FeS, the solution
turned tar black.
Name:
Copper(II)Sulfide
Formula:
CuS
Observation:
NR, no reaction
Name:
Formula:
Observation:
NR, no
reaction
Name:
Formula:
Observation:
NR, no reaction
Name:
Formula:
Observation:
NR, no reaction
Observation:
Solution
turned chalky
white and
powdery.
Looks the
same as the
previous ones.
Name:
Calcium
Hydroxide
Formula:
Ca(OH)₂
Observation:
Solution turned a
very swampy
green. Like algae
on a pond.
Name:
Iron(II)Hydroxide
Formula:
Fe(OH)₂
Observation:
The light blue of
liquid copper turned
into a darker shade,
ocean blue even.
Name:
Copper(II)Hydroxide
Formula:
Cu(OH)₂
Observation:
NR, no
reaction
Name:
Formula:
Name:
Formula:
Na2CO3
(CO32-)
Observation:
Solution
turned a very
light brown
with a gloss to
it
Name:
Silver
Carbonate
Formula:
Ag₂CO₃
Observation:
Solution turned
chalky white and
powdery. Looks
the same as the
previous ones.
Looks the same as
PbCl₂, AgCl, and
PbSO₄
Name:
Lead(II)Carbonate
Formula:
PbCO₃
Observation:
Solution
turned chalky
white and
powdery.
Looks the
same as the
previous ones.
(Very
interesting.)
Name:
Calcium
Carbonate
Formula:
CaCO₃
Chem 101
Observation:
Observation:
Solution turned a
The light blue of
dark, dirty green.
liquid copper stayed
Looks murky.
relatively the same in
Name:
color shade, however,
Iron(II)Carbonate it appears chalkier
Formula:
with a white tinge to
FeCO₃
it.
Name:
Copper(II)Carbonate
Formula:
CuCO₃
1. Did you notice any patterns? Explain the patterns you noticed.
I did notice patterns. A few reactions yielded a solution that was tar-like in appearance (Row 1).
My guess is because of the sulfur turning it black mid reaction. Furthermore, one reappearing
pattern was the powdery-white effect Na2CO3 seemed to cause (Last row). The solution would look rather
thick in consistency and chalky. However, NaOH and Na2SO4 both had this effect in some other solutions. My
hypothesis is that since Na is present in each reaction, it is making the produced solution chalky. I am not sure
why that is however.