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URGENT !!!!NU STIU LA a si b !!!!!(am pus 30 de puncte )

URGENT NU STIU LA A Si B Am Pus 30 De Puncte class=

Răspuns :

a) cf%=mdf*100/msf
mdf=mdi=ci%*msi/100=20*600/100=120gNaCl
msf=msi+m apa=600+200=800g solutie
cf%=120*100/800= 15%

b)m apa evaporata= msi-msf
cf%=mdf*100/msf
mdf=mdi=c%*msi/100=500*10/100=50gNaOH
14=50*100/msf=>msf=50*100/14=5000/14=357,14g
m apa evaporata= 500-357,14=142,86gH2O

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