You have made up a solution of known molarity but now realize that you need to know

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You have made up a solution of known molarity but now realize that you need to know the molality instead. Find the molality of sucrose, C12H22O11, in 1.06 m C12H22O11(aq), which is known to have density 1.140 g · mL–1.

ANTICIPATE The mass of 1 L of aqueous solution is close to 1 kg, so the numerical value of the molality can be expected to be close to that of the molarity, but with different units, of course.

PLAN Use procedure 3 in Toolbox 5E.1, taking note of the discussion of units.


Toolbox 5E.1 HOW TO USE THE MOLALITY CONCEPTUAL BASIS The molality of a solute is its concentration in moles

Step 2 Use the molar mass of the solute, Msolute to find the mass of the solute from its amount: msolute =

Example 5E.2 shows how to carry out this conversion. 3. Calculating the molality, given the molarity This

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Chemical Principles The Quest For Insight

ISBN: 9781464183959

7th Edition

Authors: Peter Atkins, Loretta Jones, Leroy Laverman

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