Volume of Solutions Exercises

Question 1 (1 point)

A solution is prepared by dissolving 23.1 g of CaC12 (MW = 110.98 g/mol) in 325 mL of water. The density of the resulting solution is 1.05 g/mL. The concentration of CaC12 in this solution is molar.

Answer accurate to three decimal places.

Your Answer:

word image 2117

Answer

Question 2 (1 point)

A solution is prepared by adding 0.8 mol of KCI (MW = 74.55 g/mol) to 879 g of water. The concentration of

KCI is molal.

Answer accurate to three decimal places.

Your Answer:

word image 2118

The decomposition of N205 proceeds via the reaction:

2 N205 -Y 4 N02 + 02

The reaction is first order and has a rate constant of 4.82 x 10-3 s-1 at 64 cc.

The rate law for the reaction is rate word image 2119

o

k

IN0214 1021

IN-,0512

O k word image 2120 [02)

word image 2121C)

k

IN20512

word image 2122

1021

O klN20512

o word image 2123

Question 4 (1 point)

A first-order reaction has a rate constant of 0.33 min-I . It takes word image 2124 min for the reactant concentration to decrease from 0.27 M to 0.09 M.

Give answer to two decimal places.

A second-order reaction has a half-life of 10 s when the initial concentration of reactant is 0.95 M. The rate constant for this reaction isM-ls-l.

Give answer accurate to two decimal places.

Your Answer:

word image 2125

Answer

Question 6 (3 points)

For the following reaction, concentration data was collected.

Experiment word image 2126 Initial Rate

Number

  1. 0.273 0.763 2.83
  2. 0.273 1.526 2.83
  3. 0.819 0.763 25.47

The order of the reaction in A is:

word image 2127

Question 8

For the reaction 2 H20 (l)

= [H2]2 [021

= [H20]2

O word image 2128

word image 2129 IH2121021 IH2012

O

word image 2130 [H212 1012 IH2012

2H2 (g) + 02 (g), the equilibrium expression is:

Question 7 (1 point)

The K for the equilibrium below is 7.04 x 10-2 at 480.0 D C.

2 C12 (g) + 2 1-120 (g) +4 HCI (g) + 02 (g)

What is the value of K at this temperature for the following reaction?

2 HCI (g) + 1/2 02 (g) —+ C12 (g) + H20 (g)

word image 2131

Question 9

The pH of 0.010 M trimethylamine is 10.74 at 25 cc. What is the hydroxide ion [-OH] concentration?

Give answer to 5 decimal places (sorry I can’t figure out scientific notation on D2L).

Your Answer:

word image 2132

Answer

Question 10 (1 point)

The pH of a 0.5 M aqueous solution of formic acid, HCH02, at 25.0 oc is 2.0. What is the value of Ka for formic acid?

Give answer to 5 decimal places (sorry I can’t figure out scientific notation on D2L).

Your Answer:

word image 2133

Answer

11

The acid-dissociation constant, Kä, for gallic acid is 5.24 x 10-10. What is the basedissociation constant, Kb, for the gallate ion? Give answer accurate to 6 decimal places.

Your Answer:

word image 2134

Answer

word image 2135 word image 2136 Question 12 (1 point)

Calculate the pH of a solution prepared by dissolving 0.27 mol of benzoic acid word image 2137 (C7H502H) and 0.15 mol of sodium benzoate (NaC7H502) in water sufficient to yield 1.00 L Of solution. The Ka Of benzoic acid is 6.50 x 10-5. Give your answer accurate to two decimal places.

Your Answer:

word image 2138

Question 13 (1 point)

39 mL of 0.14 M acetic acid solution is titrated with 0.10 M NaOH. What is the pH after 18 mL of NaOH have been added? (Ka for acetic acid = 1.8 x 10-5)

Give your answer accurate to 2 decimal places.

15

Given the following information, Calculate delta GO word image 2139 Give your answer in kJ.

word image 2140 Ag+(aq) 0.80 v Cr3+(aq) + 3 e – * Cr (s) -0.74 v

Your Answer:

word image 2141

Answer

Question 14 (1 point)

Consider an unbalanced equation between copper (l) ions and iron to produce copper metal and iron (Il) ions. What is oxidized in this reaction?

Fe (s) Cl.l+ Fe2+ word image 2142 (s)

word image 2143 C) Fe (s)

C) Cu (s)

O Fe2+

16

Beginning with 85 g of iron-55, calculate how much remains after 7.4 years. The half-life of iron-55 is 2.74 years.

Give your answer accurate to one decimal place.

Your Answer:

word image 2144

Answer

Question 17 (1 point)

Hassium-269 decays (eventually) to thallium-205 in a process that produces 5 electrons and several al ha articles. How many alpha particles are produced in this process?

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