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Equal masses of NaCl and KCl are each dissolved in equal volumes of solution. How do the molarities of the two solutions compare?

1. Greater for NaCl
2. Equal
3. Greater for KCl
4. Cannot be compared

Correct answer: Greater for NaCl

Solution

For the same mass and volume, the salt with lower molar mass yields more moles and thus higher molarity. NaCl (58.5 g/mol) < KCl (74.5 g/mol), so NaCl solution is more concentrated.

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