47. Using the phase diagram (Fig. 6.), determine which substance and in what quantity can be extracted from 500 kg of alloy by cooling it from 850 to 506 0C, consisting of
a) 20% (wt.) NaCl and 80% (wt.) CaCl2,
b) 20% (wt.) CaCl2 and 80% (wt.) NaCl.
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