JEE PYQ: Qualitative Analysis Question 6
Question 6 - 2020 (08 Jan Shift 1)
The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)
(1). (Aq. NaOH in a pipette and aqueous oxalic acid in a burette)
(2). (Aq. NaOH in a burette and aqueous oxalic acid in a conical flask)
(3). (Aq. NaOH in a burette and concentrated H₂SO₄ in a conical flask)
(4). (Aq. NaOH in a volumetric flask and concentrated H₂SO₄ in a conical flask)
Show Answer
Answer: (2)
Solution
Oxalic acid is a primary standard solution whereas H₂SO₄ is a secondary standard solution. Accurate measurement requires a primary standard (oxalic acid) in the conical flask and NaOH in the burette.
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