Ignoring protolysis reactions (i.e. proton transfer reaction), specify what ions are present in a solution upon dissolving each of the following substances in water: (b)(NH₄)₃PO₄ (c) Na₂Cr₂O₇(d) NaPF₆.

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Identify the chemical formula of the compound: Na_2Cr_2O_7.

Recognize that Na_2Cr_2O_7 is an ionic compound composed of sodium ions (Na^+) and dichromate ions (Cr_2O_7^{2-}).

When Na_2Cr_2O_7 dissolves in water, it dissociates into its constituent ions.

Write the dissociation equation: Na_2Cr_2O_7 (s) → 2 Na^+ (aq) + Cr_2O_7^{2-} (aq).

Conclude that the ions present in the solution are Na^+ and Cr_2O_7^{2-}.

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주요 개념

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

Dissociation of Ionic Compounds

When ionic compounds like Na2Cr2O7 dissolve in water, they dissociate into their constituent ions. This process involves the separation of the positive and negative ions due to the interaction with water molecules, which stabilizes the ions in solution.

Ionic Species in Solution

In the case of Na2Cr2O7, the compound dissociates into sodium ions (Na+) and dichromate ions (Cr2O7^2-). Understanding the specific ions formed is crucial for predicting the chemical behavior of the solution, including its reactivity and potential applications.

Role of Water as a Solvent

Water is often referred to as a 'universal solvent' due to its ability to dissolve many ionic and polar substances. The polar nature of water molecules allows them to surround and solvate ions, facilitating their movement and interaction in solution, which is essential for various chemical processes.

Ignoring protolysis reactions (i.e. proton transfer reaction), specify what ions are present in a solution upon dissolving each of the following substances in water: (b)(NH4)3PO4 (c) Na2Cr2O7 (d) NaPF6.