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Does 1.0 M KNO3 or 1.5 M KNO3 have a higher boiling point?

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 1.5 M KNO3 - both solutions contain KNO3, but the one with higher concentration is 1.5 M, as 1.5 M > 1.0 M. 1.0 M also increases the boiling point, but not to as great an extent as 1.5 M does. 
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