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ADDITIONAL ASPECTS OF AQUEOUS EQILIBRIA
Multiple Choice Questions
1. A solution is known to contain ions ofAg*, Cu2+ andPb2*. What will
happen when 1.0 M HCl is added to the solution?
A) No precipitate will form. *
./»
B) Only AgCl will precipitate.
*
oth AgCl and PbCl2 will precipitate.
v. \
The Ksp ofCaF2 is 4.3 X !Q-n in pure water.
D) Both PbCl2 and CuCl2 will precipitate.
E) All three ions will form precipitates.
solubility ofCaF2 is expected to:
A) increase because Co2* ion is acidic.
/~* P~
—^
2 F~
B) decrease because Co2* ion is acidic,
increase because F ion is basic.
D) decrease because F' ion is basic.
1
E) remain the same as in pure water.
3.
Which has the greatest molar solubility in water at 25°C?
ammonium nitrate
B) barium sulfate
C) iron(II) sulfide
fit
£ Jil
1
la
D) lead(II) carbonate
E) copper (II) phosphate
4.
I
When mixed, which pair of aqueous solutions will form a precipitate?
A) KNO3andCaBr2
B)
NaNO3and(NH}2CO3
CaCl2andK2CO3
D)
K2SO4and(NH}2S
E) LiClOandCuSOd
II
P
1
SI
328-
TOPIC
17
5. Which of these slightly soluble salts xoould shozv an
increased solubility in a 1.0 M aqiceous solution ofHCl?
I!
/. PbCl
Wi'K
m
II. CuCO,
A) I only
III. Ba3(PO}2
f
B) Ilonhj
C) I and II only
Sffift
II and III only
E) III and III
6. If equal volumes of the following pairs are mixed, which of the resulting solutions will NOT make a buffer solution?
A) 0.20 MNaCN and 0.40 MHCN
B) 0.20 M HF and 0.10 M KOH
C) 0.20 M KF and 0.05 M HCl
0.15 MNaCN and 0.20M HCl
!
0.20 M NaOH and 0.30 M HF '.
7. 0.10 M hydrofluoric acid (Ka = 6.8X10*) is 'titrated with 0.10 M
sodium hydroxide solution. Which indicator is the most appropriate
for signaling the endpoint of the titration? The approximate pH
range for the color change of each indicator is given.
e
51
A) bromphenylblue pH=3-4.5
jrity phenolphthalein
C) thymol blue
pH =J3 -10
pH = 1.5 - 2.5
D) alizarin yellozv R pH=ll-12
E) bromthymolblue pH=6-7
8. Which acid is best zuhen preparing a buffer ofpH = 9.0?
A) hydrazoic acid, Ka = 1.9 x 10s
B) hydrofluoric acid, Ka = 6.8 $10*
C) sulfuric acid, strong acid, Ka2 = 1.2 x 102
hypobromous acid, Ka = 2.5 x 103
E) carbonic acid, Kat = 4.3 x 107, Ka2 = 5.6 x 10n
ADDITIONAL ASPECTS OF AQUEOUS EQILIBRIA
9. Which of the following hydroxides is not amphoteric?
<7ffi rrnr-r
<^ ^-~
B) Al(OH)3
C) Zn(OH)2
D) Pb(OH)2
E)
Sn(OH)
10. When dissolved in aqueous solution which pair would behave as a
buffer
buffer?
A) HClandNaCl
B) KOHandKCl
^ HNO2andNaNO2
D)
HNO3andNHJSTO3
E)
Ca(OH)2andCaS04
k
co/ 4"
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