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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Balanced chemical equations are given as:

a) Reaction between Co(NO₃)₂ and Na₂C₂O₄:

Co(NO₃)₂ + Na₂C₂O₄ $\to C o C_{2} O_{4} + 2 N a N O_{3}$

Co(NO₃)₂ionizes to produce Co²⁺ and NO₃^- ions and Na₂C₂O₄ ionizes to produce 2Na⁺ and C₂O₄ ^2- ions.

$C o {(N O_{3})}_{2} \to C o^{2 +} + 2 N {O_{3}}^{-}$

$N a_{2} C_{2} O_{4} \to 2 N a^{+} + C_{2} {O_{4}}^{2 -}$

$C o {(N O_{3})}_{2} + N a_{2} C_{2} O_{4} \to C o^{2 +} + 2 N {O_{3}}^{-} + 2 N a^{+} + C_{2} {O_{4}}^{2 -}$

The equation can be rearranged as:

$C o {(N O_{3})}_{2} + N a_{2} C_{2} O_{4} \to C o^{2 +} + C_{2} {O_{4}}^{2 -} + 2 N a^{+} + 2 N {O_{3}}^{-}$

$C o {(N O_{3})}_{2} + N a_{2} C_{2} O_{4} \to C o C_{2} O_{4} + 2 N a N O_{3}$

b) Reaction between Co(NO₃)₂ and Pb(NO₃)₂ :

Co(NO₃)₂ + Pb(NO₃)₂ $\to C o {(N O_{3})}_{2} + P b {(N O_{3})}_{2}$

Co(NO₃)₂ionizes to produce Co²⁺ and two NO₃^- ions and Pb(NO₃)₂ ionizes to produce Pb²⁺ and two NO₃ ^- ions.

$C o {(N O_{3})}_{2} \to C o^{2 +} + 2 N {O_{3}}^{-}$

$P b {(N O_{3})}_{2} \to P b^{2 +} + 2 N {O_{3}}^{-}$

$C o {(N O_{3})}_{2} + P b {(N O_{3})}_{2} \to C o^{2 +} + 2 N {O_{3}}^{-} + P b^{2 +} + 2 N {O_{3}}^{-}$

Though the reaction has different cations but the anions are same hence, product formed will be same as reactant combining. No rearrangement can take place here.

Co(NO₃)₂ + Pb(NO₃)₂ $\to C o {(N O_{3})}_{2} + P b {(N O_{3})}_{2}$

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