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2014-09-16T22:34:06+03:00
NaCl - sare
masa sare = 0,15 * 58,5 = 8.775 g
masa apa = 300 g 
masa solutie = 8,775+300 = 308,775 g
c%=md/ms * 100 = 8,775/308,775 * 100 = 2.842 %
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