MIT2_500s09_hw01 - MIT OpenCourseWare http:/

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MIT OpenCourseWare 2.500 Desalination and Water Purification Spring 2009 For information about citing these materials or our Terms of Use, visit: .
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MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING 2.500 Desalination and Water Purification Homework Set #1 Due 24 February 2009 Problem 1: Ionic strength of seawater Mixed electrolytes are characterized by the ionic strength , I I = 1 2 m i z i 2 i in which m i is the molality of each ion in solution and z i is the valence of the ion. Using the data for standard seawater (35 , 000 ppm) distributed in the first lecture, calculate the ionic strength of seawater and compare it to that of 0.62 molal aqueous sodium chloride. Problem 2: Heats of solution In class, we considered the heat of solution of sodium chloride in water ( Δ H sol =+ 3 . 88 kJ/mol). This is a relatively small heat of solution. The following quick calculations are for some other salts, which have substantially larger heats of solution. For each substance, determine the temperature change when 5.0 g of solute are added to 50.0 g of water in an adiabatic
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MIT2_500s09_hw01 - MIT OpenCourseWare http:/

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