F.,a,*

/b-a^
Name:
Lab: Tu
Chem401 Exam3 Spring2016
w
rh
(Nuss)
Multiple Choice
Identify the choice that best completes the statement or anst)ers the question.
1.
2.
The nitrate
pts ea)
ofwhich one of the following cations would be expected to be colorless in aqumus solution?
E@
Which of the following is the electron configuration of Cd+?
A. l{rl3d
B. lAr)3il4s2
C.
lArl3/'4s2
E.
[Ar]3d4st
co = fn.l 1qts2 3d+
Cosf= [n"f jdt oQ+er re^onorrr\ ? ele c,*nmS.
-T1..e,
Most transition metals have
as
Lewis CfCid S
A.
4.
(6
'The one t]na,l rs nol a *ranr:il'ort rneta,l.
D. Cu2*
c. Ni2*
B. Co2*
A. Cr3*
"@
3.
ID: A
Seat #
d;
vacant
d
$
e.leCtrOns
G
re
rezr'orraA F"Tt#,
orbitals that can accept shares in electron pairs; tlus they can act
.
bases B. p; acids C. s; bases D. p; bases
E.
@
Complexes that consist of a metal atom or ion and polydentate ligands are called
A.
coordinationspheres
B@
C. ligand complexes
D. ligand spheres
E. none of these
5.
Below is a list of complex ions and their structures. One pair is incorrectly matched. Which pair?
Complex Ion
A.
B.
[CuBr2]-
C.
lPtcNH3)2Cl2l
D.
ICu(NH3)a]2*
ICr(CO)o]2*
E.
6.
Structure
trigonal planare
linear
square planar
square planar
+hi5 re?ui
res*hree
A' (,0;)'o
B.
K,,
( ,i1trs
F.,a,* ill,* r:::
a*a
K6e = Lax)L
C.
D.
(&o)"'
E.
(K"o)'t'
f
g anJs
octahedral
How is the molar sol ubility, X (mol/L), related to the K.p for FezS,r; i.e ., X:
K,,
L
C
_?
zx)z -(I * " X"+x)
x= @ =(yJY,
1l L'os \'oq )
=
togxf
ID: A
Name:
7.
'
Which response includes all of the following statements about the neutral square-planar compounds
l:'N=="]
I.
II.
III.
IV.
V.
The
The
The
The
The
'
l:w.==l
iEornars
compounds are optical isomers.- no ,*he.t1oJ-e geornr.-{dc
$
isomer on the left is the trans isomer.
isomer on the left is the cis isomer.
Ct.
o
isomers arenonsuperimposablemirror images.-Thfc i
+i?€c,eT'f
isomers have different properties.
all ioyt..,er
v/
{
{
A.
I. IV. and V
C.
I, III, and IV
D.
E.
B@
8.
opka'l ito,f*=
pro perl'es
I, II, and IV
III and V
Consider the following statements about optical isomers. Which statement is true?
A. Optical isomers do not interact with
C. Both are true
polarized light.
Dextrorotary implies that light is rotated
to the left.
B.
9.
r ntI
hare,
" @
Which of the following pairs of coordination compounds are not ionization isomers?
T"ffi*"f:n:*5"5$*f
l"^ A e-'z'*"]ti - \'frs'
,
A.
rcr(f{H)5So4rBrandrcr(NH3)5Brrso,
B.
[Co(NHr5NOr]SOa and [Co(NH3)5SO4]NO2
Pl\e'r.-
f
+ lef+ ha-s c,\,c^nd B,riSh I Y,as I on& Br
D. [CoOIHr)sBr]SOa and [Co(NH:)sSO+]Br
Clz]B r z and [Pt(NH3)aBr2]
C.
[PI(NH3
E.
[PtOIH3)4Brz]Clz and [Pt(NH3)aCl2]Br2
)4
10. How are pentaamminenitrocobalt(Ill)
L.-Tt*Xl'lo"
LNH3J
A.
B.
C.
They are ioruzation isomers.
They are hydrate isomers.
Thev are coordination isomers.
D.
E.
They are geometric isomers.
12
sulfate and pentaamminenitritocobalt(Ill) sulfate related?
LpT[d*o.'
LNH3J
Tl"€ NOz t;3and tinPa tp txo
a*orn iA +)-{ Cankr t.ai*|"' ed; fG€,ren+ & nor orlroc"r,
ct>
ID: A
Name:
11. Which
A.
B'
of the following salts would be expected to be more soluble in acidic solution than in pure water?
Ac,d e iosreose l+a- ao[utb;t,Ifi o C' b.*g.
Tt{. snh botla Connpo..^A B Ca-Fz.
AgBr
Hg'l;'
c.@
F - r-t,
D. PbCl2
E. BaSO+
12. Calculate [Ap.]
-fi-r-
in a saturated AI(OH)3 solution at 25"C.
E
A.
6.6
x
to-e
"m
D.
E.
13.
x
M
M
1.5 x l0'7 M
8.4
l}-t&
v
/
I
e
1.9
x
B.
o.so
1.1
c.@
D' 2'3
E.
t-.:eots
oc'i t]F'
10-33
7t
[xY]x)E = a+Xq = t. 9 X,O-33
IF-x rd33
x= solwblt;\
= a.9 x,D-l
l1a?-
What ratio of NaOCN/ HOCN will produce a buffer with pH = 3.10?
C3,5x
pKq, =
3 , Lt
A.
+r'"
+y
7<
ro-{) =
-to3
14.
K,p:
o [-
= *;qrc+\+ ?;u?a+r
Ql for[\sci)
I
e
e,onj . bas
pft = pko -+ I o3 C ra.*io)
I o3 (.a,tio) J Pt+ -?Ln=
g
g
'44
,C
I
r4+1o =
K^:3.5 x
ttt
lOa for HOCN
6t
]'
lo
-i
.Qqn = -o,Z4E
rafie = o'qq
1.4
What is the pH of a solution which is 0.0400 Minformic acid, HCO2H, and 0.0600
Mn
sodium formate,
NaHCOO? Ko:1.8 x lOa for HCOzH
pk* - - rg Ct,gx IdY) = a. +{'S
^@
B.
C.
D.
E.
3.96
4.00
9.52
4.08
pl+=Pka-+'o3ffi
pw=r.19s *ro3
ffi
= 7.?-,rS
+ lo3( t,S)
= B,?Q,s
+ O .llU -- 7,12t =) $.1a
ID: A
Name:
15. At25"C,7.4 x 10-5 mole of Cd(OH)2
dissolves to give 1.0 liter of saturated aqueous solution. What is the
solubility product, Krp, for Cd(OH)2?
%r ffi.conrd CdCol{)zrs)
*
L c)t,+ 4DA
Z oH.
1.7
x 10-5
2.9
x
D.
E.
5.8
4.1
x 10-15
x 10-12
C@
16.
Ksr
A.
B.
x
I
L
E
x l}-s M
x 104 M
3.7 x 10'7 M
4.6
1.9
C.
D@
E.
17.
8.5
x
l0-8
a-*
€7
=Ccd,*]f o\+1'
l0-8. What is the molar solubility of PbFz in 0.10 MNaF?
Pblzcs1
B.
Z,8*tdrm
= 0.y * ldsY e.1^ , D-t)'
?- l,Oqx td'"| =) l. I X I D 'Y
l}-to
K.p for lead fluoride is 3.7
A.
Cd':*, + LouTq->
= l.Lt xtoim
r\a*^.
= i4A
/
i1t..q.\
*tl
o,lo+?-d
l9p= A.+ x r't8 =C*)(o. trr + zx)' x(xYp. I D)z
x = 7.+Y lD-8
t"
M
rf
=
g,?
X lC6
What is the normality of a 0.200M solution of strontium hydroxide?
5r
CoH)z, ca+)
$irwe i*
-+ B,r?i+ + LowTon)
con'r, dorro-+e
?-ob+'t
ea^^ nq,rArall?re ?-Yr+
Zl-rvloLarfg Ct't\
A.0.100N
,-.1-
B. 0.200N Norrr.7,;'t5 Cu) =
c. 0.300N
;.f z L(o,zoo*)=o,t{oa,N
;.
E.
18.
0.500N
What concentration of A13+ must be exceeded in a solution buffered at pH
precipitation of AI(OH), at25"C? K,o for AI(OH)3: 1.9 x 10'33.
rc O
t_
fi =, t L{, Otl -Lt ,BrC = q.,ZO
Ks? =
A.
6.3
x
C.
4.1
5.3
2.2
x 104 M
x 1t7 M
x l0'8 M
l0-ro
M
B.cffi"r{;
D.
tr
v-
Eo
Hj\= r C9'" = b,axt{'"m
t'
=Q *1 s+a-l
= Lftt3{
(c,a xt,J-to)g
fnt"t
l,qxto -?j
: 4.80 in order to initiate
fo
H
_33
frts+]= l,q * LD_
(G,r,x(c'o)e
:!,Gy-
oF
lo-b
p,utpl*aJr-on
n
ID: A
Name:
19.
__ acid if it took 20.0 mL of0.100\4 NaOH to completely
What is the concentration ofa solution of sulfiric
neutralize 10'0nil-of-theacidi-
tlrr Mo;1]1ls$
CrAJrl,(rc)(v6\
---.
Na = [MaYV)=(ryoPNYzu'orr"L)
'-2'
Na
i a]inq 3|oicht'^!'+'1
Itt [q?r++ Hz,6o.1 + Flrzsot vzt*z-o
Lo.o^LNuivx o:Lgo^,.d. o z.oDm,.ol No-oH
LttL
',
1.,o6"'tn,,t rJa'oH*
'
I
H-z'9 Dv
A. 0.0500M auir - Y- =O,Lo? 1 l 'oor"'^^'rt
B. o.o667M $H'o ?! I a,o rrtL V* -9o u
D. 0.200M fi\ =l
O ,lO 0
=Wtoq
E.
20.
t'
Qo 64-ot 1*2'9 o'/
zrrla-oH
I
= o,zoov
Azso{':
*FT-o_A
0.300M
Which titration curve could describe the titration of a solution
"rStffi
w.6. +{+ftleA
5.p
bY addition of a solution
d69ry.
S.fr . #,r7.*oJ
b3 a'ft'
vol. KOH added
vol. KOH added
s.A. 4lbld
bt s, ovol. KOH added
B.
21.
The following anions can be separated by precipitation as silver salts: Cl', Br-, I-, CtOa2-.If Ag* is added to a
solution containing the four anions, each at a concentration of 0.10 M, in what order would they precipitate?
Compound
K'p
l-
AgC'l
AgzCrOa
AgBr
AgI
A.
x l0'ro
9.0 x 10-12
3.3 x l0-r3
1.5 x 10-16
1.8
AgCt-+Ag2CrO+--+AeBr24g_
B.
AgCrOa+AgCl AgBr+AgI
D. AgzCrO++Ag{ Agtsr-+AgCl
Agl-+AlBr-+AgCl-+AgCrOa'
E,.
C.
The Brnall€f, +hQ' va'tue oE k-se,
t}-c. rnore i ogotu'bte.*f^o- C'npo"nd
I'oe6in
orr& +r4- goonor ;+ t^'ift
lo
P.ee'P[ \o'{e '
ID: A
Name:
_
22.Avolumeof25.0mLof0.100MCH:COzHistitratedwith0.100MNaoH.whatisthepHaftertheaddition
tl
Cf ' X x
of 12.5 mL of NaoH? (K" for cII3CorH = 1.8 x 10i) pka = -l
aml 'oE-=
ttA"/'+
3
o, loQln!4lL
e L'Zfw..rrol
G'rqt cBaco.H= a,5,l,rwl-x D'19@' - a'Sor^'*ol
L2'iS,
aL*
CllaCooH +-ol'l-
lluO t Cl'{ecoo-
?
/
,.rra\ 2_5o -:;
c 'L?a
q
E1G
t.34
B 2'87
A.
aV
I
3W
E.
5.87
*rlaa
-;;r
ry-
lo3 -ft
=pVo-*
'
LL:, =q,7t1+)oa0\
=.1,*f
qr
ta1.z<
q,41+
=
we a,<a.& *r*- j*idPoinlJ PW1'l='*l'
Completion
C ompl ete each
23.
s
t dt emenl.
(3 pts ea)
Consider the complex ion [coclr]1-. complete each statement as it applies to this complex.
A) The seometry of the complex
B) The complex
c) That makes
fru, j
Co ?tFrl
'
h$b-
qgz3d"
eJ+ =far] ?d+
L
unpaired electrons.
the magnetic behavior
D) The complex would b.
24.
i, OCAahedfC, I
fi10,-nagnetic.
-1'-
3L -11. L
(dia or para)
spin. (high or low)
(3 pts ea)
Consider the complex [vln{en)2@)G)]No, when answering the following questions.
A) The oxidation number for the Mn in the complex
is
!5
'
B) when the complex dissotves in water, ir forms a total quantity
l,
ions.
fiqr&a).(")Cr>]**d Noi
(€AzCF)(x)J+ ar"n4r+'nq frtsiJc L]
(eo)z (F)fNO)] Iisomer of this complex would have the f".muh ffnn
c)Thecoordinationsphereconsistsoftheformual
D) one eeerdinetien
of
ioo\ra'hon'
f
fnn
or
Con(en\'
(lJoXslr
Name:
ID: A
Short Answer
25.
Calculate the pH of a solution prepared by adding 115 mL of 0.100 Msodium hydroxide to l00.mLof
-lt
0.100 M nitric acid solution. (7pts)
No.o U +o Hlrl0t nn a,*Ilrc,tru
*hc tame oa
fhis
oid}t5
ernl oH- = (tr:r"u)(o.toot4) = ll.5m,.^ol
qrn* tt+ = Croo.r*L)C o.lognr): ttl'D,"\aoI
HNOg+ No.OH + Hzo + Na'NOc *
I to'o
tt'5
c -ru,o ^to.o
t
26.
+ot{-+ \lzD
@
+Y
r0'o
FAr.5
coao**#oa,fuW.B'
t"t] , l.S r'.rnpl = l'trd\
(ttt+ too.)rnL ztsfiL
po H = - loyU..lXx
pH = r{.oD - L.lb
H+
= b,18x tri3
nrr
1t'3)' e' 11"
= ll' 8Y
Hydrochloric acid is used to titrak 25.0 mL of0.0100 M NHs. What is the pH after the addition of40.0 mL
0.0100 M HCI? (& for NH3 = 1.8 x 10) (7pts)
arnt
ar
+
frlf.fr= ( Zf.o-r)Co.ot
of
oon)' o.aSonr+ol
l+el =(to,oroufo.eloon)a @,toorrooI
+ NHa * )NHrt +'i1z,o oR tt+ * NHs-- Nilr+
I O.Voo 0.25lD a
q -.25, -o.zSD fi'?,So
i,
H3o+
E o.tsD p
o.?.so
Yoq have ad^d.c{ rno1e add *kon go1rho'Jhas'.o-a'HArsloA/ 3o gou are pos+ {f^r- egr,rlvatence Pellr+'
turot = o. lSDn*r-'rl -.
o.oo)? ln
v @@t.ot
cro,il*L
b?w'u
a'b3
pt+= -l tl3 ( o'oo atsl\.-
.
Name:
ID: A
/o, rn fti6l
3,O rtrr*ol
27
. ' If 100- mL of 0.030 M HCl, solution is added to i 00. mL of buffer solution which is 0. l0 M inNi{3
and
0.lA M inNH4CI, what will bethe pH of the new solution? Kb = 1.8 x l0-i for NH3. (7 pts)
N Ha
I
t g.
e-
-7.O
F
€
+ Hao+ -r
+.
NHq+ +HzO
-j.0
rF
,0.
+b.O
*Q
la.
3,g
pll= pko+l.,3
t<a=
€
"tr
pKo = -
= g.ass+to3
:i.z*s
Lr3
(- o. a Gq)
b
= 8.9
oyb .g Ly, o-'o) " !,]55
I
+ log ( o.6zg)
=1.?55 +
28.
!, r.pxtft{ ,T5Lx td,,
Kb r.t* to-5
XU
=@
How many grams of KNOz must be added to 5.00 liters of 0.67 M HNO2 solution to produce a buffer with
pH : 3.15? Assume no change in volume. K^: 4.5 x 10a for HNo2. (7 pts)
pl<r"a
arn*
acrd 2 Cs.oo q(o. u+M\t
pH, pkc. + to3
2
+
-lls=3.Sit 2lr1+
,o,
rs
-3.g\+ '- 7o. lEl = ,og*
lco'rq?
2+,.o'bzs
r"ase , (o-
trlr)C*c'd)
-l
aG.6
7.1"€r
\
x,d') = !. gql
of
I
)
t
I
2
'u{'t( 3'A s-) 1-i3 '*ol
? 75 ,lt 3 /t"*ol
K No. = ?Q.to t- IY.o I +L(tb'oo)
z
k ruoL
xro
I.g
z.\3 rnol x
r?ra =)
lttg
tno
I
=
= (v
3
ID: A
Name:
29.
ffifiil:
;lii,fj :i.l,?j:1il1,j;-3.H.T*
s. r
be
e
d
r
]G
B) What is the splitting energy of this complex in kJ/mol? (5 pts)
E=A" a I.c. z cG.to:,bxtd3's.s\fz.1i8rrD"rr./s)
(635n-X toq rr/nr",)
A' = 3. t Zg 7< ro-'1 S/ion
g.lZg x,o-'" r * 9-pze
a.
ion
to'3 ;o" = 1.87 xrOrf/rnol
r"r ol
s
,*I=,=
l.ggx,g-q*
.
tooO 3
30.
oF
l8 t ne/""o{
-mot
What will the concentrations of Fd* and CN- be in a solution prepared by adding 0.72 mole of NaCN to 1.0L if
0:020M Fe(NOrr? The complex ion dissociates: [F{CN)5]& e Fd* + 6CN-, and its formation constant is 7.7
x 1036. (9 pts)
*
Fe'* r*L,
I
0".ozo
+
^ca\ -+ [ r.
CD C N
o.7L
-Gx
c -*
? ,Lp
Cc.t.r),rl
A
+{
-
ii L. R.
x2 o'oLo
Fc"+
I
oiZ-6(azn\
o. oLO
Kc =€*
=
4a
l.o* to
--=
? .a * lO3b
fr.(eN)e]- = F"?u* (rONO
o.bo
I o.o2O
+{x
"h(
c -7<
X '. o .U,o+ b>1
E o.o2,b-l
-(o
.bQt6*
(,x)(o
)G ay r(x)(o'g'=' l. ! x titl'
K&o f r.tnl tcot-lG
-
fF. Cco)bl{x
(o.'czo
-'X )
? (l',5^]:-'l[r.g41 - 5.fifu ro
ag
(o.ao\6
Equilib [Fez*, :5.6X
_98
/On{
Equilib tCN-]
-
U>-
60 l't.
o.Q.zo
fr"'1
'
, u.,o zo's,,b* ^'fr*r''o@
TD: A
Name:
Consider the titration of 50.0 mL of a 0. 15 M solution of hydrocyanic acid, HCN, with
O.ZS M sodium hydroxide, NaOH. Calculate the pH at the equivalence point.
31. EXTRA CREDIT:
.I".lr :;:i;:t::"'
B
,ngres oF o..cja '
poin], rnores ,,,,s,a.ta.r
(go.ornL aciA)C o. lsi r'^) = +, S ptrn€l He.-N
reaoh +4iN' p}'
{p
Nq,oll
,nn^<r\ej
+s
This *t^sn rcauires
r*L
+.5 r*r".ol ftoO H*
l'tcN
+
xlc'o l{
or }}eN + OH-
+
mt'rto I
'L6
O
a ?O. PL
Hzo + r'tlcv
$zO + gN- (:odi,.- is
r?.5 +.r
c -+.r -+.Y
r :p A
o..
tpeo{"'{-'l)
d
1
/' 5
?.{*,'.ol
tr€ ftq, how a so(u+Dn *^ -.1t
oB
a 'e^k aitd '^lhial"is
baeic anA w ill rrndergo hg d.s I q sis '
Tl*r -lo'*o\, so-\s,\-on votum€- is, &.O*U+ 39'rtL = 90'
fcnr-l = t5 *t'"t = o,og i+srvt
$tC. nt- tCNr- + Hz-D
I o.ogl+f /
A6
*f--'--
e -><
<
E a .o13?S-*.
rwL
-l{
H C-N # ol:t'
=
Hu=
-
-5i
r.z.s*rD
+)f
,<x
Ku=/,.9>trc€ = >(-
x.L
At lL--
-.
o'oq1"
g':*
:;
\
o.o*?s
--
\
xz@*to-s} o.oe37s) =i
?-lo3 ft'sx to-3)= z'zL
poH
IY,OO- Z'BL=
=
?Y4
I
W
10
= 1.5
x'l6t=
L'Hl