What is the pH of 0.015 mol/dm³ sulfuric acid?
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D - AQA - A-Level Chemistry - Question 34 - 2020 - Paper 3
Question 34
What is the pH of 0.015 mol/dm³ sulfuric acid?
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B
C
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Worked Solution & Example Answer:What is the pH of 0.015 mol/dm³ sulfuric acid?
A
B
C
D - AQA - A-Level Chemistry - Question 34 - 2020 - Paper 3
Calculate the concentration of hydrogen ions
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Given that sulfuric acid (H₂SO₄) is a strong diprotic acid, it dissociates completely in water:
[ H_2SO_4 \rightarrow 2H^+ + SO_4^{2-} ]
Thus, the concentration of hydrogen ions can be computed as follows:
[ \text{[H}^+\text{]} = 2 \times 0.015 , \text{mol/dm}^3 = 0.030 , \text{mol/dm}^3 ]
Calculate the pH from hydrogen ion concentration
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The pH can be calculated using the formula:
[ \text{pH} = -\log_{10} \text{[H}^+\text{]} ]
Substituting the concentration:
[ \text{pH} = -\log_{10}(0.030) \approx 1.52 ]
Select the correct answer
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Based on the calculations, the correct answer is C: 1.52.
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