CH-1343
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A mixture contains sand, common salt and iodine.
• Sand is insoluble in water.
• Common salt is soluble in water.
• Iodine sublimes on heating.
Which sequence of steps will obtain pure common salt?
1 heat gently to sublime iodine
2 add water and stir
3 filter
4 evaporate filtrate to dryness
• Sand is insoluble in water.
• Common salt is soluble in water.
• Iodine sublimes on heating.
Which sequence of steps will obtain pure common salt?
1 heat gently to sublime iodine
2 add water and stir
3 filter
4 evaporate filtrate to dryness
- 1, 2, 3, 4
- 2, 3, 4
- 1, 3, 2, 4
- 2, 1, 3, 4
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