1. . 2 , 5%.
3. , .
4. .
3.
.
1. : .
2. :
1. .
2. .
3. .
.
- , .
(w)
() , :
(1)
m- =m(A)+m(H2O) (2)
().
(), () (/) :
m-=ρ*V- (3)
1: 135 15 . ?
w=15*100/135+15=10%
2: 500 18%
m(A)= w* m-/100=18*500/100=90
m(H2O)= m--m(A)=500-90=410
3: 1200 20% 800 . ?
1) , . :
m(A)= w* m-/100=20*1200/100=240
2) :
w=240*100/800=30%
4: 500 KJ KJ 19%. , 20 % ?
1) KJ :
m(A)= w* m-/100=19*500/100=95
2) KJ , (500+). (1):
20=95+/500+=240
=6,25
.
v(A) V(-).
()= v (A)/ V(-) (/) (4)
K2SO4 C(K2SO4)=1/ 1 K2SO4 .
v (A)=m(A)/M(A) (5)
(6) (7) :
()=m(A)/M(A)*V (6)
m(A) (), () (/), V ().
5. KOH, 50 5,6 .
CKOH=m(KOH)/M(KOH)=5,6*1000/56*50=2 / 2 KOH
|
|
.
.
.
1. 110 56 . ?
2. 910 2 309 NaOH, ρ=1,3 /.
:
) NaOH
)
3. 1 =4 /, =0,2 /.