Question
Question 4 The mixing tank in Figure B.3 initially holds 500 L of a brine solution with a salt concentration of 0.2 kg/L. For the first 10 min of operation, valve A is open, adding 12 L/min of brine containing a 0.4 kg/L salt concentration. After 10 min, valve B is switched in and valve A is closed, adding a 0.6 kg/L c
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