8/7/2019 PC_devoir3-tr2-2010-2011

1/1

. .R=10E=6 V .

.t=0 .1

. .i .2.BA .(i(t) = A(1-e-Bt: .34. UR

.. I0 .

I0 .UR . .

.r=10r ..L . ..t=10ms ..t=20 ms .

I- HCN . S . .

C=10-2 mol.L-1 .pH 5.6525.:Ke= 10-14. .HCN .1

. . .2 . KA .3

pKApKA9.3.

II- Va=10 ml C6H5COOH(Na CA

++HO

-(

=3.10-2mol/LCb .pH .

..1 .CA .23. .

.4,2 ::pKAVB .4 = 4 mL.

.r L C LC E=5 V

.t=02 1 k . C1=22F

. .UC .1 .2.L. 1 .3.t=15 ms .4

.

.C1 C2 .5).-2 (

.2 ..C2 . t1=0 .

t2=15 ms.

0.25

0.75

1

0.5

0.5

11

1

1

0.5

0.5

1

1

0.5

11.5

0.51

1.5

0.511

1.5

:32011/2010 : 2h . 3)I)7

)II)6

)7 (

K

E

(L,r)

R

C

K

1 2

L ,rE

5 10 15 20 25

2

-2

t(ms)

-1

-2

2 4 6 8

2

4

6

8

10

VB(mL)

pH

10 20 30 40 50

1

t(ms)

UR(V)

1,8

2,6