( ) + 3H ( ) + 8H ( ) - St. Cloud State University

CHAPTER 4
EXAMPLES
1.
How many milliliters of a 0.206 M HI solution are needed to reduce 22.5 mL of a 0.374 M KMnO4 solution
according to the following equation:
10HI ( aq) + 2KMnO 4 ( aq) + 3H2SO 4 ( aq) ⎯⎯
→ 5I2 ( aq) + 2MnSO 4 ( aq) + K 2SO 4 ( aq) + 8H2O (l)
2.
Balance the following net ionic equation by the oxidation number method. The reaction takes place in acidic
solution.
−
Cr2O2−
→ Cr 3+ ( aq) + IO −3 ( aq)
7 ( aq) + I ( aq) ⎯ ⎯
3.
Balance the following net ionic equation by the oxidation number method. The reaction takes place in basic
solution.
MnO −4 ( aq) + Br − ( aq) ⎯⎯
→ MnO2 ( s ) + BrO −3 ( aq)
4.
Using the half-reaction method, balance the combination (oxidation-reduction) reaction of magnesium metal and
nitrogen gas:
Mg ( s ) + N2 ( g) ⎯⎯
→ Mg3N2 ( s )
5.
Calculate the molarity of a solution made by dissolving 70.2 g of sodium sulfate (Na2SO4) in enough water to
form 275 mL of solution. [MM Na2SO4 = 142.042]
6.
How many milliliters of 1.350 M KCl solution are necessary to give 0.722 moles of KCl?
7.
What are the [Al ] and [SO4 ] concentrations in a 0.300 M Al2(SO4)3 solution?
8.
How would you prepare 1.00 L of a 0.600 M solution of copper (II) sulfate (CuSO4)? [MM CuSO4 = 159.5]
9.
How many grams sodium sulfate (Na2SO4) are required to make 350 mL of 0.50 M Na2SO4?
[MM Na2SO4 = 142.042]
3+
2-
10.
How much 5.0 M HNO3 would be required to make 750 mL of 0.10 M HNO3?
11.
Commercially available concentrated hydrochloric acid is an aqueous solution containing 38.0% HCl by mass.
(a) What is the molarity of this solution? The density is 1.19 g/mL. (b) How many milliliters of concentrated HCl
are required to make 1.00 L of 0.10 M HCl? [MM HCl = 36.461]
12.
What volume of 2.50 M NaCl is required to react completely with 225 mL of 0.0100M AgNO3? The chemical
equation for the reaction is:
NaCl ( aq) + AgNO 3 ( aq) ⎯⎯
→ NaNO 3 ( aq) + AgCl ( s )
13.
In a titration experiment, a student finds that 0.5468 g of KHP (a monoprotic acid called potassium hydrogen
phthalate (KHP) (KHC8H4O4). is needed to completely neutralize 23.48 mL of a NaOH solution. What is the
concentration (molarity) of the NaOH solution? [MM KHP 204.22
KHC8H4O 4 ( aq) + NaOH ( aq) ⎯⎯
→ KNaC8H4O 4 ( aq) + H2O (l)
14.
How many milliliters of a 1.28 M H2SO4 solution are needed to neutralize 60.2 mL of a 0.427 M KOH solution?

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