Equimolar solutions of NaCl(aq), NH4Cl(aq) and NaCH3COO(aq) were prepared - HSC - SSCE Chemistry - Question 10 - 2020 - Paper 1
Question 10
Equimolar solutions of NaCl(aq), NH4Cl(aq) and NaCH3COO(aq) were prepared.
In which of the following are these salt solutions listed from least to most acidic?
A. ... show full transcript
Worked Solution & Example Answer:Equimolar solutions of NaCl(aq), NH4Cl(aq) and NaCH3COO(aq) were prepared - HSC - SSCE Chemistry - Question 10 - 2020 - Paper 1
Step 1
A. NaCl(aq), NH4Cl(aq), NaCH3COO(aq)
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Answer
This solution order suggests that NaCl, a neutral salt, is least acidic. NH4Cl produces somewhat acidic conditions due to NH4+, which can donate a proton in solution, thus making it more acidic than NaCl. NaCH3COO, being the conjugate base of a weak acid (acetic acid), is expected to have a basic nature or potentially contribute to an increase in acidity depending on the context.
Step 2
B. NaCl(aq), NaCH3COO(aq), NH4Cl(aq)
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Answer
This order suggests that NaCH3COO is more acidic than NaCl; however, NaCH3COO is expected to be less acidic than NH4Cl, making this option incorrect as well.
Step 3
C. NH4Cl(aq), NaCl(aq), NaCH3COO(aq)
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Answer
This order incorrectly places NH4Cl, which is more acidic, before NaCl, which is neutral. It does not reflect the least to most acidic arrangement.
Step 4
D. NaCH3COO(aq), NaCl(aq), NH4Cl(aq)
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Answer
NaCH3COO would typically be less acidic than NH4Cl and more basic, while being more acidic than NaCl. Therefore, this order correctly reflects the trend from least acidic (NaCH3COO) to most acidic (NH4Cl). This is the correct answer.
