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meme
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Joined: Sun Nov 25, 2007 12:22 pm

Problem

Post by meme »

A hospital saline solution is analyzed to confirm its concentration. A 50.0 mL sample with a mass of 50.320g is evaporated to dryness. If the solid sodium chloride residue has a mass of 0.453g, find the molar concentration of the NaCl solution.
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Andy0
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Joined: Wed Nov 28, 2007 3:35 pm

Post by Andy0 »

Use dimensional analysis:

.453g * 58.4430 g/mol = 26.474679 moles
Grams -> moles

26.474679 moles * .05L / 1L = 1.32373395 moles/L
Moles -> moles/L

The solution has a concentration of 1.32373395mole/L
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