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A 500 mL solution of Saltwater is boiled until 250 mL of water has evaporated.

What happens to the concentration of salt in the remaining liquid?

  1. The salt concentration stays the same during boiling.
  2. The total mass of the solution remains 500 grams.
  3. The salt concentration is halved as water leaves.
  4. The salt concentration doubles in the remaining liquid.

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