Ap Chemistry Worksheet - Dr. Kathleen Gorski, Wilbraham And Monson Acaddemy Page 8
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244.15 Specify what ions are present in solution upon dissolving each of the following substances in
water: (a) ZnCl
, (b) HNO
, (c) (NH
)
SO
, (d) Ca(OH)
.
2
3
4
2
4
2
4.23 Name the spectator ions in any reactions that may be involved when each of the following
pairs of solutions are mixed. (a) Na
CO
(aq) and MgSO
(aq) (b) Pb(NO
)
(aq) and Na
S (aq)
2
3
4
3
2
2
(c) (NH
)
PO
(aq) and CaCl
(aq).
4
3
4
2
4.24 Write balanced net ionic equations for the reactions that occur in each of the following cases.
Identify the spectator ion or ions in each reaction.
(a) Cr
(SO
)
(aq) + (NH
)
CO
(aq) !
2
4
3
4
2
3
(b) Ba(NO
)
(aq) + K
SO
(aq) !
3
2
2
4
(c) Fe(NO
)
(aq) + KOH (aq) !
3
2
4.36 An aqueous solution of an unknown solute is tested with litmus paper and found to be acidic.
The solution is weakly conducting compared with a solution of NaCl of the same concentration.
Which of the following substances could the unknown be: KOH, NH
, HNO
, KClO
, H
PO
,
3
3
2
3
3
CH
COCH
(acetone)?
3
3
4.37 Classify each of the following substances as a nonelectrolyte, weak electrolyte, or strong
electrolyte in water: (a) H
SO
, (b) C
H
OH (ethanol), (c) NH
, (d) KClO
, (e) Cu(NO
)
.
2
3
2
5
3
3
3
2
4.48 Determine the oxidation number of sulfur in each of the following substances: (a) barium
sulfate, BaSO
, (b) sulfurous acid, H
SO
, (c) strontium sulfide, SrS, (d) hydrogen sulfide, H
S.
4
2
3
2
(e) Based on these compounds what is the range of oxidation numbers seen for sulfur? Is there
any relationship between the range of accessible oxidation states and sulfur’s position on the
periodic table?
4.58 (a) Use the following reactions to prepare an activity series for the halogens:
Br
(aq) + 2 NaI (aq) ! 2 NaBr (aq) + I
(aq)
2
2
Cl
(aq) + NaBr (aq) ! 2 NaCl (aq) + Br
(aq)
2
2
(b) Relate the positions of the halogens in the periodic table with their locations in this activity
series. (c) Predict whether a reaction occurs when the following reagents are mixed: Cl
(aq)
2
and KI(aq); Br
(aq) and LiCl (aq).
2
4.69 (a) Which will have the highest concentration of potassium ion: 0.20 M KCl, 0.15 M K
CrO
,
2
4
or 0.080 M K
PO
? (b) Which will contain the greater number of moles of potassium ion: 30.0
3
4
mL of 0.15 M K
CrO
or 25.0 mL of 0.080 M K
PO
?
2
4
3
4
4.75 (a) Starting with solid sucrose, C
H
O
, describe how you would prepare 250 mL of a
12
22
11
0.250 M sucrose solution. (b) Describe how you would prepare 350.0 mL of 0.100 M
C
H
O
starting with 3.00 L of 1.50 M C
H
O
.
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22
11
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4.86 An 8.65-g sample of an unknown group 2A metal hydroxide is dissolved in 85.0 mL of
water. An acid–base indicator is added and the resulting solution is titrated with 2.50 M HCl
(aq) solution. The indicator changes color signaling that the equivalence point has been reached
after 56.9 mL of the hydrochloric acid solution has been added. (a) What is the molar mass of
2+
2+
2+
the metal hydroxide? (b) What is the identity of the metal cation: Ca
, Sr
, Ba
?
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