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Ch.17 - Applications of Aqueous Equilibria
McMurry - Chemistry 8th Edition
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모든 교과서McMurry 8th EditionCh.17 - Applications of Aqueous Equilibria문제 117b
17장, 문제 117b

Is the solubility of Zn(OH)2 increased, decreased, or unchanged on addition of each of the following substances? Write a balanced net ionic equation for each dissolution reaction. (See Appendix C.6 for formulas of complex ions.) (b) KOH

검증된 단계별 안내
1
Identify the solubility equilibrium of Zn(OH)2. The dissolution of Zn(OH)2 in water can be represented by the equation: Zn(OH)2(s) ⇌ Zn2+(aq) + 2OH-(aq).
Consider the effect of adding KOH to the solution. KOH is a strong base that dissociates completely in water to form K+ and OH- ions.
Apply Le Chatelier's Principle to predict the shift in equilibrium. The addition of OH- ions from KOH will increase the concentration of OH- in the solution, causing the equilibrium to shift to the left, thus decreasing the solubility of Zn(OH)2.
Write the net ionic equation for the dissolution of Zn(OH)2 in the presence of excess OH-: Zn(OH)2(s) + 2OH-(aq) ⇌ Zn(OH)42-(aq).
Conclude that the solubility of Zn(OH)2 decreases upon the addition of KOH due to the common ion effect, where the increased concentration of OH- shifts the equilibrium towards the formation of the solid Zn(OH)2.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
3m

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Solubility Product Constant (Ksp)

The solubility product constant (Ksp) is a numerical value that represents the equilibrium between a solid and its ions in a saturated solution. For a sparingly soluble compound like Zn(OH)2, Ksp helps predict how changes in concentration of ions affect solubility. When a substance that shares a common ion is added, the solubility typically decreases due to the common ion effect.
추천 영상:
가이드 코스
01:47
Solubility Product Constant

Common Ion Effect

The common ion effect refers to the decrease in solubility of a salt when a solution already contains one of the ions present in the salt. In the case of Zn(OH)2, adding KOH introduces OH- ions, which shifts the equilibrium to favor the formation of solid Zn(OH)2, thus reducing its solubility. This principle is crucial for understanding how additional ions influence solubility.
추천 영상:
가이드 코스
02:53
Common Ion Effect

Net Ionic Equations

A net ionic equation represents the actual chemical species that are involved in a reaction, excluding spectator ions. For the dissolution of Zn(OH)2 in the presence of KOH, the net ionic equation highlights the formation of Zn(OH)4^2- ions and the precipitation of Zn(OH)2. Writing net ionic equations is essential for clearly illustrating the chemical changes occurring in solution.
추천 영상:
가이드 코스
00:51
Net Ionic Equations
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