Chem homework

Foundations of Chemistry I Fall 2022Homework 4
Deadline: Wednesday October 12th 8:15am
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1. Zumdahl 4.34 [4 pts]
On the basis of the general solubility rules given in Table 4.1, predict which of the
following substances are likely to be soluble in water.
a. Zinc chloride
b. Lead(II) nitrate
c. Lead(II) sulfate
d. Sodium iodide
e. Cobalt(III) sulfide
f. Chromium(III) hydroxide
g. Magnesium carbonate
h. Ammonium carbonate
2. Zumdahl 4.36 [3 pts]
When 1.0 mole of solid lead nitrate is added to 2.0 moles of aqueous potassium
iodide, a yellow precipitate forms. After the precipitate settles to the bottom, does
the solution above the precipitate conduct electricity? Explain. Write the complete
ionic equation to help you answer this question.
3. Zumdahl 4.112 [3 pts]
A 500.0-mL sample of 0.200 M sodium phosphate is mixed with 400.0 mL of 0.289 M
barium chloride. What is the mass of the solid produced?
4. Zumdahl 4.64 [4 pts]
Sodium hydroxide solution is usually standardized by titrating a pure sample of
potassium hydrogen phthalate (KHC8H4O4, often abbreviated KHP), an acid with one
acidic hydrogen and a molar mass of 204.22 g/mol. It takes 34.67 mL of a sodium
hydroxide solution to titrate a 0.1082-g sample of KHP. What is the molarity of the
sodium hydroxide?
5. Zumdahl 4.76 [4 pts]
Assign oxidation states to all of the following atoms.
a. UO22+
b. As2O3
c. NaBiO3
d. As4
e. HAsO2
f. Mg2P2O7
g. Na2S2O3
h. Ca(NO3)2
6. Zumdahl 4.120 [2 pts]
A 10.00-g sample consisting of a mixture of sodium chloride and potassium sulfate is
dissolved in water. This aqueous mixture then reacts with excess aqueous lead(II)
nitrate to form 21.75 g of solid. Determine the mass percent of sodium chloride in
the original mixture.
Suggested additional problems (not required, not graded):
Zumdahl 4.35, 4.37, 4.49, 4.57, 4.63, 4.65, 4.75, 4.105, 4.113, 4.123

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