1 g of each of the following substances is dissolved in 1 L of water - VCE - SSCE Chemistry - Question 1 - 2002 - Paper 1
Question 1
1 g of each of the following substances is dissolved in 1 L of water.
In which one would the pH of the resultant solution be closest to 7?
A. H₂SO₄
B. NH₃
C. NaHSO₄
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Worked Solution & Example Answer:1 g of each of the following substances is dissolved in 1 L of water - VCE - SSCE Chemistry - Question 1 - 2002 - Paper 1
Step 1
A. H₂SO₄
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Answer
Sulfuric acid (H₂SO₄) is a strong acid that completely dissociates in water, significantly lowering the pH.
Step 2
B. NH₃
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Answer
Ammonia (NH₃) is a weak base that does not significantly lower the pH as it does not completely dissociate in water.
Step 3
C. NaHSO₄
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Answer
Sodium hydrogen sulfate (NaHSO₄) can partially dissociate to release H⁺ ions, but the solution would still be acidic.
Step 4
D. NaCl
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Answer
Sodium chloride (NaCl) is a neutral salt that does not change the pH of a solution significantly, thereby keeping it closest to 7.
