Explanation First, write the dissociation reaction of NH 4 Cl and then the reaction between NH 4 + and water. NH 4 Cl ⇌ NH 4 + + Cl - NH 4 + ( a q ) + H 2 O ( l ) ⇌ NH 3 ( a q ) + H 3 O + ( a q ) Concentration(M) NH 4 + ( a q ) + H 2 O ( l ) ⇌ NH 3 ( a q ) + H 3 O + ( a q ) Initial 0.2 M 0 0 Change − X + X + X Equilibrium 0.2 − X X X Now, write the expression for K a K a = [ NH 3 ][H 3 O + ] [NH 4 + ] K a = [ X ][ X ] [0

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Chapter 18.5, Problem 18.6AFP

Interpretation Introduction

Interpretation: To determine the Ka for the given solution.

Concept introduction: Acid dissociation constant will give the ratio between the concentration of the products to that of the reactants. The acid dissociation constant will vary depending on the strength of the acid.

Ka=[Products][Reactants]

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Chapter 18.4, Problem 18.5BFP

Chapter 18.5, Problem 18.6BFP

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21. Zn Cl₂→ ZnCl2 22. ZnCO3 ZnO CO₂ 23. Mg + Sg MgS 24. Fe + Cl₂ FeCl3 25. Ag + S8 Ag₂S 26. K S8 K₂S 27. Al HCI AlCl3 H2 28. Mg H3PO4 Mg3(PO4)2 + H₂ 29. Cu + AgNO3 Cu(NO3)2 + Ag 30. Al + Pb(NO3)2 Pb + Al(NO3)3 31. Zn + Sn(NO3)4 Zn(NO3)2 Sn 32. Cl2 + All 3 AlCl3 _ 12 33. Br2 + Cul CuBr 12 34. KBr + Pb(NO3)2 KNO3 PbBr2 These next ones have an element shared between two different compounds. The Total amount in the Reactatnt still needs to equal the total amount in the product. 35.H₂O2 ← H₂O + 0₂ 36. C₂Ho CO2 + H₂O 37. Zn + HCI → ZnCl+ H₂ 38. NH3 + _HCl → NH.C 39. Mg(OH)2 + H3PO4 → H₂O+ Mg3(PO4)2 40. NHẠOH + FeCl3 NH4Cl + Fe(OH)3

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Chapter 18 Solutions

CHEMISTRY:MOLECULAR...(LL)-W/CONNECT

Ch. 18.2 - Prob. 18.1AFP Ch. 18.2 - Prob. 18.1BFP Ch. 18.2 - Prob. 18.2AFP Ch. 18.2 - Prob. 18.2BFP Ch. 18.2 - Prob. 18.3AFP Ch. 18.2 - Prob. 18.3BFP Ch. 18.3 - Prob. 18.4AFP Ch. 18.3 - Prob. 18.4BFP Ch. 18.4 - Prob. 18.5AFP Ch. 18.4 - Prob. 18.5BFP

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To determine the K a for the given solution. Concept introduction: Acid dissociation constant will give the ratio between the concentration of the products to that of the reactants. The acid dissociation constant will vary depending on the strength of the acid. K a = [Products] [Reactants]

Solution Summary: The author explains how the acid dissociation constant determines the Ka value for the given solution.

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Chapter 18 Solutions