Question

Care este concentratia procentuala a unei solutii obtinute prin dizolvarea a: a)20 g zahar in 170 g apa; b)30 g soda caustica in 270 g apa; c)50 g sare de bucatarie in 250 g apa; d)5 g acid citric in 45 g apa.

Answer 1

c%=(md/ms)*100 md=masa dizolvat ms= masa solutiei a) c%=(20/190)*100 c%= 10,52% b)c%=(30/300)*100 c%=10% c) c%=(50/300)*100=16.66% d) c%=(5/50)*100=10%