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Sagot :
To determine which solutions are unsaturated, we need to compare the amounts of solute added to the water with the solubility limits at [tex]\(20^\circ C\)[/tex].
1. Solution A:
- Amount of solute added: 20 g
- Solubility of the solute: [tex]\(37\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(20\)[/tex] g is less than [tex]\(37\)[/tex] g, the solution A is unsaturated.
2. Solution B:
- Amount of solute added: 10 g
- Solubility of the solute: [tex]\(10\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(10\)[/tex] g is equal to the solubility limit of [tex]\(10\)[/tex] g, solution B is at saturation point, not unsaturated.
3. Solution C:
- Amount of solute added: 65 g
- Solubility of the solute: [tex]\(32\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(65\)[/tex] g is greater than [tex]\(32\)[/tex] g, solution C is saturated (or possibly supersaturated if it was heated to dissolve more initially), and therefore not unsaturated.
4. Solution D:
- Amount of solute added: 7 g
- Solubility of the solute: [tex]\(4\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(7\)[/tex] g is greater than [tex]\(4\)[/tex] g, solution D is saturated (or possibly supersaturated if it was heated to dissolve more initially), and therefore not unsaturated.
Based on the above comparisons:
- Solution A is unsaturated.
Hence, the only unsaturated solution is Solution A.
1. Solution A:
- Amount of solute added: 20 g
- Solubility of the solute: [tex]\(37\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(20\)[/tex] g is less than [tex]\(37\)[/tex] g, the solution A is unsaturated.
2. Solution B:
- Amount of solute added: 10 g
- Solubility of the solute: [tex]\(10\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(10\)[/tex] g is equal to the solubility limit of [tex]\(10\)[/tex] g, solution B is at saturation point, not unsaturated.
3. Solution C:
- Amount of solute added: 65 g
- Solubility of the solute: [tex]\(32\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(65\)[/tex] g is greater than [tex]\(32\)[/tex] g, solution C is saturated (or possibly supersaturated if it was heated to dissolve more initially), and therefore not unsaturated.
4. Solution D:
- Amount of solute added: 7 g
- Solubility of the solute: [tex]\(4\)[/tex] g per [tex]\(100\)[/tex] g of water
- Since [tex]\(7\)[/tex] g is greater than [tex]\(4\)[/tex] g, solution D is saturated (or possibly supersaturated if it was heated to dissolve more initially), and therefore not unsaturated.
Based on the above comparisons:
- Solution A is unsaturated.
Hence, the only unsaturated solution is Solution A.
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