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General Chemistry Principles, Patterns, and Applications, 2011

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2Fe(s) + 3Br 2 (aq) → 2FeBr 3 (aq)<br />

How many milliliters of a 5.0 × 10 −2 M solution of bromine in water are required to react completely with<br />

750.0 mg of iron metal?<br />

23. Aluminum reacts with HCl according to the following equation:<br />

2Al(s) + 6HCl(aq) → 2AlCl 3 (aq) + 3H 2 (g)<br />

If 25.0 mL of a solution of HCl in water is required to react completely with 1.05 g of aluminum metal, what is<br />

the molarity of the HCl solution?<br />

24. The precipitation of silver chloride is a diagnostic test for the presence of chloride ion. If 25.0 mL of 0.175 M<br />

AgNO 3 are required to completely precipitate the chloride ions from 10.0 mL of an NaCl solution, what was<br />

the original concentration of NaCl?<br />

25. Barium sulfate is virtually insoluble. If a 10.0 mL solution of 0.333 M Ba(NO 3 ) 2 is stirred with 40.0 mL of a<br />

0.100 M Na 2 SO 4 , how many grams of barium sulfate will precipitate? Which reactant is present in excess?<br />

What is its final concentration?<br />

A N S W E R S<br />

1.<br />

Compound Molarity (M) Solution Density (g/mL) Mole Fraction (X)<br />

H2SO4 18.0 1.84 0.82<br />

CH3COOH 0.393 1.00 7.21 × 10 −3<br />

KOH 3.60 1.16 6.33 × 10 −2<br />

2.<br />

3. 100.0 ml of 0.40 M KI: dissolve 6.64 g of KI in enough water to make 100.0 mL of solution; 100.0 ml of 0.65 M<br />

NaCN: dissolve 3.18 g of NaCN in enough water to make 100.0 mL of solution.<br />

4.<br />

5.<br />

a. 0.474 M glucose<br />

b. 0.28 M Na 3 PO 4<br />

c. 0.0221 M I 2<br />

6.<br />

7.<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

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