5. Within a factor of 10, what is the approximate molar solubility of PbCl2 in a solution of 0.20 M Cr ions? (A) (B) (C) (D) 1.6 x 102 M 1.7 x 10$ M 5.0 x 103 M 4.0 x 104 M

Introductory Chemistry: A Foundation
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Chapter7: Reactions In Aqueous Solutions
Section: Chapter Questions
Problem 16QAP
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Questions 4 and 5 refer to the following information.
Pb(CIO4)2 + 2 KCI → PbCl2 + 2 KCIO4
A chemist mixes dilute solutions of lead (II) perchlorate and potassium chloride to precipitate
lead (II) chloride (Ksp = 1.7 x 105).
5. Within a factor of 10, what is the approximate molar solubility of PbCl2 in a solution of 0.20 M CI1
ions?
(A)
(B)
(C)
(D)
1.6 x 102 M
1.7 x 105 M
5.0 x 103 M
4.0 x 10-4 M
6.
Ethanoic acid (CH3COOH) has a much lower vapor pressure than ethanol (CH3CH2OH). What is the
most reasonable explanation?
(A) The polarizability of two oxygen atoms increases the London forces of attraction in ethanoic acid
compared with ethanol.
(B) Hydrogen bonding in ethanoic acid is the strongest attractive force and is mainly responsible for
the observed data.
(C) Both ethanol and ethanoic acid have an - OH, so the difference is the dipole of the second oxygen
that increases the attractive forces.
(D) Ethanol has an - OH group and can hydrogen bond; therefore, the London forces must cause the
effect.
Transcribed Image Text:Questions 4 and 5 refer to the following information. Pb(CIO4)2 + 2 KCI → PbCl2 + 2 KCIO4 A chemist mixes dilute solutions of lead (II) perchlorate and potassium chloride to precipitate lead (II) chloride (Ksp = 1.7 x 105). 5. Within a factor of 10, what is the approximate molar solubility of PbCl2 in a solution of 0.20 M CI1 ions? (A) (B) (C) (D) 1.6 x 102 M 1.7 x 105 M 5.0 x 103 M 4.0 x 10-4 M 6. Ethanoic acid (CH3COOH) has a much lower vapor pressure than ethanol (CH3CH2OH). What is the most reasonable explanation? (A) The polarizability of two oxygen atoms increases the London forces of attraction in ethanoic acid compared with ethanol. (B) Hydrogen bonding in ethanoic acid is the strongest attractive force and is mainly responsible for the observed data. (C) Both ethanol and ethanoic acid have an - OH, so the difference is the dipole of the second oxygen that increases the attractive forces. (D) Ethanol has an - OH group and can hydrogen bond; therefore, the London forces must cause the effect.
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