% separated Molecules Adding energy is necessary to separate molecules Energy is
ID: 541245 • Letter: #
Question
% separated Molecules Adding energy is necessary to separate molecules Energy is released when separated molecules dissolve. 2. Figure 9.3 shows an energy diagram for the dissolving of an ionic compound. Discuss what factors are going to tend to make this process more favorable-in other words would likely make the com- pound more soluble 1 Step 2 Solution Solid or Liquid Net Energy Change dissolving You Feel the Net Change FIGURE 9.3 Energy Diagram for the Dissolving Modified from Marano, N of an lonic Compound Schmelsser,J: Eisen, L."Inquiry-based activities for general chemistry Part I-Solubility."Explanation / Answer
When ionic solid is dissolved in water the following processes may takes place.
Step 1: For a solute to dissolve, energy is needed to break the attractions between particles of solute. Here Esol-sol >0. It is endothermic process.
Step 2: separated solute particles dissolve in solvent to form solution; here energy comes from solvent to solute particles and results in release of energy.
So Esolution <0, and the process is exothermic.
Net energy change from the energy diagram is: Edissolving = Esol-sol - Esolution
Edissolving > 0.
The ionic compound is more soluble.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.