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Which one of the following statements about 10.0 mL of 0.10 M HCl and 10.0 mL of 0.10 M CH₃COOH solutions is true? A - VCE - SSCE Chemistry - Question 3 - 2014 - Paper 1
Question 3
Which one of the following statements about 10.0 mL of 0.10 M HCl and 10.0 mL of 0.10 M CH₃COOH solutions is true? A. Each solution will have the same electrical co... show full transcript
Worked Solution & Example Answer:Which one of the following statements about 10.0 mL of 0.10 M HCl and 10.0 mL of 0.10 M CH₃COOH solutions is true? A - VCE - SSCE Chemistry - Question 3 - 2014 - Paper 1
Step 1
Each solution will have the same electrical conductivity.
Answer
This statement is incorrect. HCl is a strong acid and completely dissociates in solution, producing a higher concentration of ions. Conversely, CH₃COOH is a weak acid and only partially dissociates, resulting in significantly fewer ions in solution. Therefore, the electrical conductivity will differ.
Step 2
Each solution will react completely with 10.0 mL of 0.10 M NaOH solution.
Answer
This statement is true. HCl, being a strong acid, reacts completely with NaOH, and CH₃COOH, despite being a weak acid, will also react fully with NaOH as long as there is sufficient base present to neutralize it.
Step 3
Each solution will react at the same rate with 1.00 g of magnesium ribbon.
Answer
This statement is also not entirely accurate. The reaction rate can vary due to differences in acid strength. HCl, being a strong acid, will react more vigorously and quickly with magnesium compared to the weak CH₃COOH, which will react more slowly due to its lower concentration of available hydrogen ions.
Step 4
The concentration of H₃O⁺ ions will be greater in the CH₃COOH solution.
Answer
This statement is incorrect. Since HCl is a strong acid that fully dissociates, it produces a higher concentration of H₃O⁺ ions compared to CH₃COOH, which is a weak acid that only partially dissociates. Therefore, the concentration of H₃O⁺ ions is significantly higher in the HCl solution.