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A 20wt% solution of sulfuric acid in water is to be enriched to a 60wt% sulfuric acid solution by adding pure sulfuric acid. Use the attached diagram to answer part b. a. How much pure sulfuric acid should be added? ANS: 0.5kg pure acid per 1kg of 60wt% sulfuric acid solution b. If the 20wt% solution is available at 5C, and the pure sulfuric acid at 50C, how much heat will have to be removed to produce the 60wt% solution at 70C ? ANS: Q=133.5kJ/kg final solution (heat removed). How much heat will have to be added or removed to produce the 60wt% solution at its boiling point? ANS:Q= 25.3kJ/kg solution (heat removed) Figure 8.1-1 Enthalpy-concentration diagram for aqueous sulfuric acid at 0.1MPa. The sulfuric acid percentage is by weight (which, in the two-phase region, includes the vapor). Reference states: The enthalpies of the pure liquids at 0C and their vapor pressures are zero. (Based on Fig. 81, p. 325 in O. A. Hougen, K. M. Watson, and R. A. Ragatz, Chemical Process Principles: I. Material and Energy Balances, 2nd ed. Reprinted with permission from John Wiley \& Sons, New York, 1954.) This figure appears as an Adobe PDF file on the CD-ROM accompanying this book, and may be enlarged and printed for easier reading and for use in solving problems