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Lanthanum metal forms cations with a charge of 3+.

Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward ISBN: 9780321696724 27

Solution for problem 98AE Chapter 4

Chemistry: The Central Science | 12th Edition

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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward

Chemistry: The Central Science | 12th Edition

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Problem 98AE

Lanthanum metal forms cations with a charge of 3+. Consider the following observations about the chemistry of lanthanum: When lanthanum metal is exposed to air, a white solid (compound A) is formed that contains lanthanum and one other element. When lanthanum metal is added to water, gas bubbles are observed and a different white solid (compound B) is formed. Both A and B dissolve in hydrochloric acid to give a clear solution. When either of these solutions is evaporated, a soluble white solid (compound C) remains. If compound C is dissolved in water and sulfuric acid is added, a white precipitate (compound D) forms. (a) Propose identities for the substances A, B, C, and D. (b) Write net ionic equations for all the reactions described.

(c) Based on the preceding observations, what can be said about the position of lanthanum in the activity series (Table)?

Table Activity Series of Metals in Aqueous Solution

Metal

Oxidation Reaction

Lithium

Li(s) → Li+(aq)+ e-

Potassium

K(s) → K+(aq)+ e-

Barium

Ba(s) → Ba2+(aq)+ 2e-

Calcium

Ca(s) → Ca2+(aq)+ 2e-

Sodium

Na(s) → Na+(aq)+ e-

Magnesium

Mg(s) → Mg2+(aq)+ 2e-

Aluminum

Al(s) → Al3+(aq)+ 3e-

Manganese

Mn(s) → Mn2+(aq)+ 2e-

Zinc

Zn(s) → Zn2+(aq)+ 2e-

Chromium

Cr(s) → Cr3+(aq)+ 3e-

Iron

Fe(s) → Fe2+(aq)+ 2e-

Cobalt

Co(s) → Co2+(aq)+ 2e-

Nickel

Ni(s) → Ni2+(aq)+ 2e-

Tin

Sn(s) → Sn2+(aq)+ 2e-

Lead

Pb(s) → Pb2+(aq)+ 2e-

Hydrogen

H2(g) → 2 H+(aq) + 2e-

Copper

Cu(s) → Cu2+(aq)+ 2e-

Silver

Ag(s) → Ag+(aq)+ e-

Mercury

Hg(l) → Hg2+(aq)+ 2e-

Platinum

Pt(s) → Pt2+(aq)+ 2e-

Gold

Au(s) → Au3+(aq)+ 3e-

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Chapter 4, Problem 98AE is Solved
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Textbook: Chemistry: The Central Science
Edition: 12
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward
ISBN: 9780321696724

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