Photo AI
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(aq) C... 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
7.1.2 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). This is because H₂SO₄ is a strong diprotic acid, which means it can donate more than one proton (H⁺) per molecule. Thus, it produces a higher concentration of ions in solution compared to HNO₃, which is a monoprotic acid and only donates one proton.
Step 3
7.1.3 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). HNO₃ is a strong acid that ionizes completely in solution, producing a higher number of ions compared to CH₃COOH, which is a weak acid and only partially ionizes. Therefore, solution B has a greater conductivity due to the complete ionization of HNO₃.