CH-467
Separation and purification
Chemistry · Secondary 3 · Medium · Separation and purification
A student heats a saturated solution of lead(II) nitrate until some water evaporates and then cools it to obtain crystals. Which step is needed to obtain pure dry crystals?
- Boil the crystals strongly to remove all water.
- Filter to collect the crystals and dry them between filter papers.
- Add more water to dissolve remaining impurities.
- Grind the crystals into a fine powder in the solution.
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