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
Evaluate H₂SO₄
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Answer
H₂SO₄ is a strong acid that dissociates completely in water, leading to a solution with a low pH.
Step 2
Evaluate NH₃
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Answer
NH₃ is a weak base. Its solution will have a pH greater than 7, as it partially dissociates to form OH⁻ ions.
Step 3
Evaluate NaHSO₄
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Answer
NaHSO₄ is a salt that can act as a weak acid in water, producing H⁺ ions and resulting in a pH that is below 7.
Step 4
Evaluate NaCl
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Answer
NaCl is a neutral salt that dissociates into Na⁺ and Cl⁻ ions. It does not affect the pH of the solution, keeping it very close to 7.
