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Ch.4 - Reactions in Aqueous Solution
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 15th EditionCh.4 - Reactions in Aqueous Solution문제 92b
4장, 문제 92b

The accompanying photo shows the reaction between a solution of Cd(NO3)2 and one of Na2S. (b) What ions remain in solution?

검증된 단계별 안내
1
Identify the ions present in the reactants: Cd(NO3)2 dissociates into Cd^2+ and NO3^- ions, while Na2S dissociates into Na+ and S^2- ions.
Write the possible products of the reaction by considering the exchange of ions. The potential products are CdS and NaNO3.
Determine the solubility of the potential products. CdS is insoluble in water, so it will precipitate, while NaNO3 is soluble and remains in solution.
Identify the ions that form the soluble product. Since NaNO3 remains in solution, the Na+ and NO3^- ions will be present in the solution.
Conclude which ions remain in solution after the reaction. The ions that remain in solution are Na+ and NO3^-.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
4m

주요 개념

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

Ionic Compounds and Dissociation

Ionic compounds, such as Cd(NO3)2 and Na2S, dissociate into their constituent ions when dissolved in water. This process involves the separation of the positive and negative ions, allowing them to move freely in the solution. Understanding this dissociation is crucial for predicting which ions remain in solution after a reaction.
추천 영상:
가이드 코스
02:11
Ionic Compounds Naming

Precipitation Reactions

A precipitation reaction occurs when two soluble ionic compounds react to form an insoluble compound, or precipitate. In the case of Cd(NO3)2 and Na2S, the reaction produces cadmium sulfide (CdS), which is insoluble in water. Recognizing the formation of a precipitate helps identify which ions will no longer be present in the solution.
추천 영상:
가이드 코스
01:53
Selective Precipitation

Spectator Ions

Spectator ions are ions that do not participate in the actual chemical reaction and remain unchanged in the solution. In the reaction between Cd(NO3)2 and Na2S, the sodium ions (Na+) and nitrate ions (NO3-) are spectator ions, as they do not form a precipitate and remain in the solution after the reaction occurs.
추천 영상:
가이드 코스
06:17
Ion Formation
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