a 10 % weight by weight aqua solution contains 5 grams of salt . calculate the amount of that should be evaporated to make it concentration 15% weight by weight
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Answer:
Urea =5g; Glucose =10 g
Weight of solute = 15 g
Weight of solvent =100-15 =85 g
m
urea
=m
1
=
MW
2
×W
1
W
2
×1000
=
60×85
5×1000
=0.98
m
glucose
=m
2
=
180×85
10×1000
=0.653
ΔT
f
=K
f
(m
1
+m
2
)=1.86(0.98+0.653)=3.038
Freezing point =−3.038
o
C
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