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Comparing Water Loss in Two Salt Removals 4 questions
Comparing Water Loss in Two Salt Removals
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An exhibit starts with 2.0 L of solution containing 10 g of dissolved salt. Two model devices remove some salt and some water. Students measure what remains. The goal is to lower salt concentration in the retained solution.
| Device | Salt remaining (g) | Solution volume remaining (L) |
|---|---|---|
| P | 4.0 | 1.0 |
| Q | 4.0 | 0.50 |
Question 1
Which device leaves the lower salt concentration?
- P only
- Q only
- Both leave the same concentration.
- There is no way to compare them.
Question 2
Explain how Q can remove salt yet leave a higher concentration than the original solution.
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The class may add pure water to the retained solution from Q. It wants to match P’s concentration without removing additional salt.
Question 3
How much water must be added if the solution’s volume increases by the volume of water added? Show how the unchanged salt mass enters your answer.
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Question 4
A student claims that after adding water Q will have removed more salt. Evaluate this claim using the mass record.
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