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The image shows two diagrams depicting the interaction between water molecules and molecules of a weak acid - HSC - SSCE Chemistry - Question 11 - 2018 - Paper 1
Question 11
The image shows two diagrams depicting the interaction between water molecules and molecules of a weak acid. The left side illustrates water molecules (represented b... show full transcript
Worked Solution & Example Answer:The image shows two diagrams depicting the interaction between water molecules and molecules of a weak acid - HSC - SSCE Chemistry - Question 11 - 2018 - Paper 1
Step 1
Describe the interaction represented in the left figure.
Answer
In the left figure, water molecules are shown clustering closely around the molecules of the weak acid. This representation suggests strong intermolecular interactions such as hydrogen bonding, where the polar nature of water molecules interacts with the charged regions of the weak acid. These interactions help stabilize the acid in solution.
Step 2
Explain the scenario in the right figure.
Answer
The right figure shows the water and weak acid molecules are more dispersed compared to the left. This indicates a lower concentration of the weak acid or a scenario where the interactions have reduced, possibly due to dilution or the presence of an additional solvent. The distance between the molecules implies weaker interactions, leading to a less stable solution.