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Formation of a solut ion from two components can be considered as:
(i) Pure solvent → separated solvent molecules, ΔH1
(ii) Pure solute → separated solute mo lecules, ΔH2
(iii) Separated solvent and solute molecules → solution, ΔH3
Solution so formed will be ideal if:
  • a)
    ΔHSoln = ΔH1 + ΔH2 + ΔH3
  • b)
    ΔHSoln = ΔH1 + ΔH2 - ΔH3
  • c)
    ΔHSoln = ΔH1 - ΔH2 - ΔH3
  • d)
    ΔHSoln = ΔH3 - ΔH1 - ΔH2
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Formation of a solut ion from two components can be considered as:(i) ...
Formation of a solution involves the mixing of two components - the solvent and the solute. The solvent is the component that is present in a larger amount, while the solute is present in a smaller amount and gets dissolved in the solvent. The process of solution formation can be understood by considering the interactions between the solvent and solute molecules.

The three steps involved in the formation of a solution are:

1. Separation of solvent molecules (H1):
In this step, the pure solvent molecules are separated from each other. This requires energy to overcome the intermolecular forces holding the solvent molecules together. The energy required for this step is denoted as H1.

2. Separation of solute molecules (H2):
In this step, the pure solute molecules are separated from each other. Similar to the solvent, this also requires energy to overcome the intermolecular forces holding the solute molecules together. The energy required for this step is denoted as H2.

3. Formation of a solution with separated solvent and solute molecules (H3):
In this step, the separated solvent and solute molecules mix together to form a solution. This step releases or absorbs energy depending on the interactions between the solvent and solute molecules. The energy change for this step is denoted as H3.

The enthalpy change for the formation of a solution (HSoln) can be calculated by considering the energy changes in these three steps.

HSoln = H1 + H2 + H3

The question asks about the conditions for an ideal solution. In an ideal solution, there are no significant interactions between the solvent and solute molecules. This means that the energy changes in steps 1 and 2 (H1 and H2) are negligible or close to zero. Therefore, the energy change for an ideal solution can be simplified to:

HSoln = H3

Hence, the correct answer is option 'A', where the enthalpy change for the formation of an ideal solution is equal to the energy change in the formation of a solution with separated solvent and solute molecules (H3).
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Formation of a solut ion from two components can be considered as:(i) Pure solvent → separated solvent molecules, ΔH1(ii) Pure solute → separated solute mo lecules, ΔH2(iii) Separated solvent and solute molecules → solution, ΔH3Solution so formed will be ideal if:a)ΔHSoln = ΔH1 + ΔH2 + ΔH3b)ΔHSoln = ΔH1 + ΔH2-ΔH3c)ΔHSoln = ΔH1 -ΔH2 -ΔH3d)ΔHSoln = ΔH3 -ΔH1 -ΔH2Correct answer is option 'A'. Can you explain this answer?
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