Problem: A puddle of coastal seawater, caught in a depression formed by some coastal rocks at high tide, begins to evaporate on a hot summer day as the tide goes out. If the volume of the puddle decreases to 29% of its initial volume, what is the concentration of Na+ after evaporation if initially it was 0.449 M? 

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A puddle of coastal seawater, caught in a depression formed by some coastal rocks at high tide, begins to evaporate on a hot summer day as the tide goes out. If the volume of the puddle decreases to 29% of its initial volume, what is the concentration of Na+ after evaporation if initially it was 0.449 M? 

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