Concentration of Solutions
Concentration of Solutions
Concentration of Solutions
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Name Class Date<br />
Problem Solving continued<br />
MOLALITY<br />
Molality is the amount in moles <strong>of</strong> solute per kilogram <strong>of</strong> solvent and is given by<br />
a number followed by an italic lowercase m. A 5 m aqueous solution <strong>of</strong> glucose<br />
contains 5 mol <strong>of</strong> C 6 H 12 O 6 per kilogram <strong>of</strong> water. Molal concentration is important<br />
primarily in working with colligative properties <strong>of</strong> solutions.<br />
General Plan for Solving Molality Problems<br />
1<br />
Mass <strong>of</strong><br />
solute<br />
in g<br />
3<br />
Mass <strong>of</strong><br />
solvent<br />
in g<br />
Convert<br />
using the<br />
molar mass<br />
<strong>of</strong> the solute.<br />
Convert<br />
using the<br />
equation<br />
1 kg 1000 g.<br />
2<br />
Amount<br />
<strong>of</strong> solute<br />
in mol<br />
m <br />
mol solute<br />
kg solvent<br />
4<br />
Mass <strong>of</strong><br />
solvent in<br />
kg<br />
5<br />
Molal<br />
concentration,<br />
m<br />
Copyright © by Holt, Rinehart and Winston. All rights reserved.<br />
Holt ChemFile: Problem-Solving Workbook 206 <strong>Concentration</strong> <strong>of</strong> <strong>Solutions</strong>
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