2-13CreatingaSolutionofKnownMolarityIn this a.docx

2-13:
Creating
a
Solut
i
on
of
Known
Molarity
In this assignment,
y
o
u will weigh out asa
m
p
le of baking soda (NaHC
O
3
) and create a solution ofknown
m
o
l
arit
y
.
1.
Start
VirtualChemLab,
select
Reactions and Stoichiometry,
and then select

Creating aSolut
i
on of Known
M
o
larity
from
t
he list of assig
n
m
ents.The lab will open in the Ti
t
ration laborato
r
y
.
2.
In the labora
t
o
r
y
, a bot
t
le of baking soda (sodiumbicarbonate, NaHCO
3
) will be next to thebalance, and an e
m
ptybeaker will be on the stir plate. Drag the e
m
ptybeaker to the spot
l
ight next

t
o
t
h
e balance, clickin the
Ba
l
an
c
e
area to zoomin, place aweigh paper on the balan
c
e, and tare the
balance.
3.
Open the bot
t
le by clicking on the l
i
d (
Remove Li
d
). Pick up the
S
c
oo
p
and scoop out so
m
e sa
m
ple by first dragging the scoop tothe
m
outh of the bottle and then pull

i
ngthe scoop down the face of the
bottle. As the scoop is dragged down
t
h
e face of the bottle it will p
i
ckup different quantities ofsolid. Select the largest sa
m
ple possible and d
r
ag the scoop
t
othe weighing paper on
th
e balance until it
snaps in place and then let go. This will put app
r
oximately1 gofsa
m
ple on the balance. Repeat
with a second
Scoop
. Record the
m
a
ss of the NaHCO
3
in the data table.
4.
Drag the we
i
gh paper to the beaker and add the NaHC

O
3
sa
m
p
le
t
othe beaker. Click on thegreen
Zoom
Out
arrow to return
t
othe laborator
y
.
5.
Drag the beaker to the 50mL graduated c
y
l
i
nder (thelargest one) by the sink and e
m
ptythe sa
m
ple
into the
c
y
linder. Hold thec
y
l
i
nder under the tap unt

i
l it fills withwater to
m
a
k
e an aqueous solution
of NaHC
O
3
. (When the graduated c
y
linder is full it will auto
m
at
i
ca
l
ly snap back into place.) Note that the solid is added and
dissolved before the volu
m
e ismeasured when
m
aking a
m
ol
ar solution.
Che
m
ists normallyuse a volu
m
etric flask for
m
aking
m
o
l

ar solutions, but
t
his is not available in the s
i
m
ulation.
6.
Determine the liters of solution
i
nthe
c
ylinder and
r
ecord the da
t
a in thedata
t
able.
7.
Determine the moles of NaHCO
3
in
the sample and r
e
cord the datain the da
t
a table.
Data
T

a
ble
ma
s
s N
a
HC
O
3
m
o
l
es
N
aH
C
O
3
liters solution
8.
The
m
olarityis calcula
t
ed using the fo
r
m
u

l
a:
mass
solute
molarity
=
=
molarmasssolute
moles
solute
L
solution
L
solution
67
Virtual ChemLab: General Chemistry, Student Lab
Manual/Workbook, v4.5
, Third Edition, by Brian F. Woodfield and Matthew C.

2-13CreatingaSolutionofKnownMolarityIn this a.docx

2-13CreatingaSolutionofKnownMolarityIn this a.docx

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2-13CreatingaSolutionofKnownMolarityIn this a.docx