MIT2_500s09_hw01

# MIT2_500s09_hw01 - MIT OpenCourseWare http:/ocw.mit.edu...

This preview shows pages 1–3. Sign up to view the full content.

MIT OpenCourseWare http://ocw.mit.edu 2.500 Desalination and Water Purification Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
This is the end of the preview. Sign up to access the rest of the document.

## MIT2_500s09_hw01 - MIT OpenCourseWare http:/ocw.mit.edu...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online