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7.1 The conductivity of three acid solutions, A, B and C, as shown below is investigated at the same temperature - NSC Physical Sciences - Question 7 - 2023 - Paper 2
Question 7
7.1 The conductivity of three acid solutions, A, B and C, as shown below is investigated at the same temperature. A 0,1 mol·dm⁻³ H₂SO₄(aq) B 0,1 mol·dm⁻³ HNO₃(a... show full transcript
Worked Solution & Example Answer:7.1 The conductivity of three acid solutions, A, B and C, as shown below is investigated at the same temperature - NSC Physical Sciences - Question 7 - 2023 - Paper 2
Step 1
Step 2
In which solution, A or B, will the bulb be brighter? Give a reason for the answer by referring to the types of acids.
Answer
The bulb will be brighter in solution A (H₂SO₄) because sulfuric acid is a strong acid and it is diprotic, meaning it donates two protons (H⁺ ions) per molecule. This results in a higher concentration of ions in solution, which enhances its conductivity compared to HNO₃, which is monoprotic and donates only one H⁺ ion.
Step 3
In which solution, B or C, will the bulb be brighter? Give a reason for the answer by referring to the types of acids.
Answer
The bulb will be brighter in solution B (HNO₃) compared to solution C (CH₃COOH) because HNO₃ is a strong acid and fully dissociates in solution, producing a higher concentration of ions. In contrast, acetic acid (CH₃COOH) is a weak acid and does not fully dissociate, resulting in fewer ions in solution and, therefore, lower conductivity.