Heat transfer course the last two pictures are appendix 1. (10 pts) Given an eva

Question

Heat transfer course the last two pictures are appendix 1. (10 pts) Given an evaporator is used to concentrate sodium hydroxide, use the attached figure to determine what temperature must be reached to cause each of the solutions to reach boiling at atmospheric pressure (1 atm): A. a 20 wt% aqueous NaOH solution B. a 45 wt% aqueous NaOH solution C. a 65 wt% aqueous NaOH solution D. If the pressure is changed to a vacuum at 0.253 atm, where the boiling point of pure wateris 150 F, determine the boiling points for the sameNaoH concentrations in A B, and C.

Explanation / Answer

from the graph

(a) for 20% solution boiling point of solution = 225 0F

(b) for 45% solution boiling point of solution = 275 0F

(c) for 65% solution boiling point of solution = 325 0F

(d) if Boiling Temperature is = 150 0F

for 20% solution boiling point of solution = 162.5 0F

for 45% solution boiling point of solution = 212.5 0F

for 65% solution boiling point of solution = 262.5 0F

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