Reactions
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Montana State University *
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Course
131
Subject
Chemistry
Date
Jan 9, 2024
Type
Pages
6
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PRECIPITATES—Exp.
C-2
Name
0\]”"‘
C'
Lab
Section
Lab
Partner
Pre-Lab
Assignment:
Study
Appendix
D.5
on
filtration
techniques.
Problem
Statements:
What
is
the
reaction
between
Co(NOs);
and
NazPO4?
Are
all
of
each
reactant
consumed
in
a
reaction?
Why
or
why
not?
I.
Data
Collection
and
Analysis:
Qualitative
A.
Dissolve
a
small
amount
(about
1
cms3)
of
solid
cobalt
nitrate,
Co(NQs)s,
in
about
20
mL
of
distilled
water.
Dissolve
a
similar
amount
of
sodium
phosphate,
NasPQ,,
in
a
second
20
mL
of
water.
Describe
the
appearance
of
each
solution.
Co(N03)y
—
disolued
iwmaliaty
g
piak
e
No,
Py
—
Yaly
lorg
to
st
Clo
s
olispors
B.
Pour
half
of
each
solution
into
a
third
beaker
and
mix
thoroughly.
(Save
the
mixture
and
two
solutions
for
later
use.)
1.
Describe
the
appearance
of
the
mixture.
2.
Assuming
the
reaction involves
the
coming
together
of
dissolved
ions,
what
are
the
possible
identities
of
the
solid
formed
in
the
mixture?
Think
up
and
carry
out
experiments
which
would
distinguish
among
all
of
the
possibilities.
Describe
the
results
of
these
experiments.
3
(0(N03)y
¥
N3
POy~
(o
5
(M4),
+9Na
WOy
coai'
¢
&NO?;
v
SV\)R"
‘
POqS’
16
a0y
iy
e
A
16w
v
Wac
s
CoA03)
for
Wt
Sl
pet
WDy
ad
b
o
o
prigie
003(004);
a
W
Wd}'
23
3.
Write
a
chemical
equation
which
represents
the
reaction
and
is
consistent
with
the
data
obtained
so
far.
Briefly
explain
your
reasoning.
2‘/\)&3004
¢
BCO[NO}.L
=l
Na
03
+
C
Oj(pofffil
C.
Separate
the
mixture
by
filtration
(see
Appendix
D.5).
Note
the
characteristics
of
the
liquid,
called
the
supernatant,
and
predict
all
of
the
materials
which might
be
dissolved
in
the
liquid.
[
1y
de.
Poosde
(olPon)
Wzgmhmm
W
pr.
fs
"
D.
Divide
the
supernatant
in
half
and
test
each
half
with
the
remaining
Co(NOs);
and
NazPO,
solutions.
Describe
the results.
Co
(o3,
-
2
VU@;
Doy
-
pinke/
pupe
E.
What
conclusions
can
be
drawn
from
these
data
concerning
the
chemicals
present
in
the
supernatant?
(e.g.,
How
might
changing
the
original
amounts
of
Co(NOs);
and
NagPO,
affect
the
composition
of
the
supernatant?)
]
Z’MW")“W/
h,fl
o
e
vemagind
o*/
803(00»1)2
Buane
of
flo_CoAo
Chagg
i
the
Wy
Py
Prside
(0%
ions
tirg
abole
Yo
fom
COs
({Dy),
=
24
II.
Data
Collection:
Quantitative
A.
Obtain
90
mL
of
stock
Co(NQOs),
solution
in
a
clean,
labeled
beaker.
Obtain
60
mL
of
stock
NasPO,
solution
in
a
second
labeled
beaker.
Record
the
concentrations
in
the
data
table
below.
Clean
and
distilled-water
rinse
four
100
mL
beakers
and
label
them
1-4.
Into
each
beaker
measure
20.0
mL
of
stock
Co(INOs);
solution.
Measure
various
amounts
of
stock
NasPO,
into
each
beaker.
The
suggested
amounts
are:
5.0,
10.0,
15.0,
and
20.0
mL
Mix
each
solution
thoroughly
and
allow
it
to
stand
for
at
least
10
minutes.
Calculate
the
masses
of
salts
added
to
each
beaker
and
record
these
amounts
in
the
table
below.
B.
Set
up
four
filter
funnels
with
filter
papers
and
labeled
collection
beakers.
Mix
and
filter
each
reaction
mixture
from
part
IT.A
through
a
separate
funnel,
collecting
its
supernatant
in
a
labeled
beaker.
You
are
to
collect
at
least
20
mL
of
each
supernatant,
clean
of
any
precipitate.
When
this
is
done,
move
on
to
part
II.C.
Data
Table
3
Concentration
of
stock
NasPO,
solution
9
-
ol?[_’
X
,O
g/mL
-3
Concentration
of
stock
Co(NQ3),
solution
D
.
Q
:
%[0
g/mL
mL
stock
mL
stock
grams
grams
Limiting
Reagent
Solution
Na;PO,
Co(NOs),
NazPO,
Co(NOs),
by
Tests
.
by
Calculation
;
GmL
20
QOMEF
powsH
Gl
0422
>
0wl
20
0.63974
Q.0usH
p.ouiq
3
1Sul
20
o004l
0o4sH
_
00Ut
4
20w
0
009948
p.oust
W
Q.0\517%
J
Wasfoq
b
2COU00
Y,
<>
(5
oy
¢
Colfdul,
)
Ly
WV
207
0.05F(
WM
3P0
[UBAH
Wasfor
x
52
¥
S
%
0-
0LbH
0-
0913
0.
015
1%
25
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C.
Describe
the
appearance
of
each
of
your
supernatants.
Divide
each
of
the
supernatants
into
two
parts.
Test
one
part
with
a
dropperful
of
Co(NOs);
and
the
other
with
a
dropper
full
of
Na3P04
solution.
Summarize
the
results
of
these
tests
below.
Sml.
NagPOy
|
Mu«,wmu
cotwo;);m
b}]
),
Eq
o
oML
NayP0y
2
Sl
lDmL
;m.
flo,nL
Supes
palt
15mL
NaaPOu
3
Hwpuent
purle
loe
),
00y
=
o
oml
NagPou
K
bw’jijmf
O"W@
F—]
rr’
5"‘
y
III.
Data
Analysis
A.
Explain
the
result
of
this
testing
of
the
supernatants.
That
is,
explain
what
these
results
show
must
have
happened
in
each
reaction
mixture.
(For
example,
why
can
you
form
more
precipitate
from
a
supernatant?
Why
don’t
all
four
supernatants
give
the
same
test
results?)
From
this
analysis,
fill
in
the
column
labelled
“Limiting
Reagent
by
Tests”
in
the
table
on
the
previous
page.
4'%{/’4/”/’
ZflbhO"‘—
(5mLJ0mL
j)5mL
[20:ML§0J69'$}""’31
i
adoled
o
O{Z"W(”fl
ColM0s),
or
MhayPOu.
T
e
color
Wflflt\/
fu
0[71)‘)3)7—
o
WasPOy
s
a
)
Ken
ks
o
|t
ovv
Lo
of
D0
i
1L
syppplns.
26
B.
Mental
Model—Draw
a
picture
showing
how
the
reaction
can
give
both
the
precipitate
and
the
supernatant
seen
in
one
of
your
reaction
mixtures.
In
other
words,
illustrate
your
reasoning
in
question
ITI.A
using
a
picture
of
the
reaction.
Nz
Pou
|
2
|
flac'flb"’t
e
A
e
o
e
%
S'nx/'/*
|
Cofbodr
|
C.
Predict
what
the
limiting
reactant
should
have
been
in
each
reaction
mixture.
Do
this
by
assuming
the
chemical equation
you
wrote
in
part
1.B.3,
page
24,
is
correct
and
then
calculating
which
reactant
should
run
out
first.
Record
the
results
of
your
calculations
in
the
last
column
of
the
data
table
on
page
25.
Show
the
calculations
for
mixtures
#1
and #3
below.
|"
A
Co\owU'
Co
(MD3),
@Nvfl
Uus
-OlsT#
wo
O
q
£
0Lty
Nagl0n
-
N,
-
o2l
-
BLIP
-
Dwlotly
Cos(f0y
lwel
.\
.
8290
.0H$'”7
(’a(wb)2.~
'\%2%‘":1
3
182.909
.
(§2.9e.
_
4
Mn"]
Ny
-
“,3,0,‘;,
'
Jg
—F
0-
035‘2?
27
IV.
Conclusion
Summarize
the
data
for
and
against
the
chemical
equation
you
wrote
for
the
reaction
between
Co(NOs)s
and
NasPO,
in
aqueous
solution.
In
particular,
explain
how
calculations
involving
weight
data
can
be
used
as
evidence
for
or
against
a
given
reaction
idea.
Finally,
do
you
feel
your
equation
reflects
what
nature
is
really
doing?
Briefly
explain.
0
Tl
culoulabivs
Cone
wd
@y
enduvee
fol
T
res
%M@q::'jmfilsfi
flo
e
S
St
"'\M_M/exp
M
iy
COMDZ
D)
J
lweding
N«),MA'
M
W
003(%'4)1
28
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- The following data were collected for the reaction 2A + 2B + C 3G+ 4 F Experiment 2 3 4 5 [A] Units of Molarity .00125 .00250 .00125 .00125 .00301 [B] Units of Molarity 00125 .00125 00302 00302 .00100 [C] Units of Molarity 00125 .00125 .00125 00375 .00115 Rate Units M/s 00870 .0174 .0508 .457 a. What is the order with respect to each reactant and what is the overall order for the reaction? Answer this question within the answer box and show your work clearly labeled on the scratch paper. b. Write the rate law for the reaction. Answer this question within the answer box and show your work clearly labeled on the scratch paper. c. What is the value and units for k? Answer this question within the answer box and show your work clearly labeled on the scratch paper. d. Predict the rate for experiment 5, you should give a value and units. Answer this question in the answer box and show your work on the scratch paper labeled clearly.arrow_forwardQ5: If the Ksp of Ca3N2 is 6.06 x 10-3, how many moles of calcium nitride (s) could you dissolve in 1.589 L of solvent (assume that calcium nitride (s) dissolves in water to form Ca2+(aq) and N3- (aq))? Enter your answer with at least 3 sig figs. Please provide only typed answer solution no handwritten solution needed allowedarrow_forwardI need help calculating the Molarity of the solution in the first picture please!!!arrow_forward
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- ution by avestigate 2003-2023 International Academy of Science. All Rights Reserved. MA What volume of a 1.25 M potassium fluoride (KF) solution would be needed to make 455 mL of a 0.838 M solution by dilution? [?] mL of 1.25 M KF 5 Q Search F5 F6 6 & F7 7 Volume (mL) . 7 * F8 8 DELL F9 9. prtsc F10 Enter home F11 Q a end F12 Insert •11 del A Backarrow_forwardCalculation A already done Please help me B ' C' D' Data available table thank youarrow_forward[Review Topics] [References) entration TUTOR Determining Mole Fraction and Mass Percent An aqueous solution of ethanol, CH,CH,OH, has a concentration of 6.99 mol/L and has a density of 0.947 g/mL. What are the mass percent and mole firaction of CHCH,OH in this solution? Mass percent CH3CH,OH = Mole fraction CH CH,OH = Submit Show Approach Show Tutor Steps progress Retry Entire Group 8 more group attempts remaining mit Answer Previous Next Email Instructor Save and Ex (? 72"F Cloudy 9:58 A 9/10/2 40 144 40A prt sc delete home end 80 %3D backspace num lock 7. home enterarrow_forward
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