O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2022 · Q271 Mark
The steps for the preparation of a pure sample of sodium nitrate are listed. 1 Titrate with dilute nitric acid until the end-point is seen. 2 Evaporate to concentrate the solution. 3 Rinse out the conical flask. 4 Add indicator. 5 Pipette a known volume of aqueous sodium hydroxide into a conical flask. 6 Cool and filter to remove crystals. 7 Repeat using the same volumes of aqueous sodium hydroxide and dilute nitric acid but no indicator. Which order of steps is correct?
A1→7→5→4→2→6→3
B3→5→7→1→2→4→6
C4→1→3→5→2→6→7
D5→4→1→3→7→2→6
✓ Correct answer
D: 5→4→1→3→7→2→6
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