S ﻻﻭﻠﺤﻤ . ﻥﺇ ﺍﺫﻫ لﻭﻠﺤﻤﻝﺍ ﺩﺠ ،ﺯﻜﺭﻤ ﻝﻙﻝﺫ ﻭ ﺱﺎﻴﻘﻝ ،ﺔﻴﻠﻗﺎﻨﻝﺍ ﺭﻀﺤﻨ ﺎﻗﻼﻁﻨﺍ ﻥﻤ لﻭﻠﺤﻤﻝﺍ S ﻥﻤ لﻭﻠﺤﻤ V = 500 mL ﻩﺭﺩﻗ لﻭﺼﺤﻠﻝ ﻰﻠﻋ ﻡﺠﺤ C H O2 ﻥﻤ ﺽﻤﺤ ﻙﻴﻭﻨﺎﺒﻭﺭﺒﻝﺍ ﻲﻘﻨﻝﺍ ﻪﺘﻐﻴﺼ ﺔﻠﻤﺠﻤﻝﺍ n = 0,1 mol ﻍﺭﻔﻨ ﻲﻓ ﺀﺎﻤﻝﺍ 02020202 ﻦﻳﺮﻤﺘﻟﺍ ﻦﻳﺮﻤﺘﻟﺍ ﻦﻳﺮﻤﺘﻟﺍ ﻦﻳﺮﻤﺘﻟﺍ . V = 25 mL /ﻥﻴﺒ ﻥ

Mazigh.batna@yahoo.fr Page 1

ﻢﻗﺭ ﺔﻌﺟﺍﺮﻤﻟﺍ ﻢﻗﺭ ﺔﻌﺟﺍﺮﻤﻟﺍ ﻢﻗﺭ ﺔﻌﺟﺍﺮﻤﻟﺍ ﻢﻗﺭ ﺔﻌﺟﺍﺮﻤﻟﺍ 0

0 0

02 2 2 2

ﻤﺘﻟﺍ ﻤﺘﻟﺍ ﻤﺘﻟﺍ ﻤﺘﻟﺍ ﻦﻳﺮ ﻦﻳﺮ ﻦﻳﺮ ﻦﻳﺮ 01 01 01 01

::::

ﻥﻴﺭﺒﺴﻷﺍ ﺽﻤﺤﻭﻫ

ﻙﻴﻠﻴﺴﻴﻝﺎﺴﻝﺍ ﻩﺯﻤﺭ

، AH ﻪﻠﻋﺎﻔﺘ ﻊﻤ ﺀﺎﻤﻝﺍ

،ﺩﻭﺩﺤﻤ ﻭ

ﺕﺒﺎﺜ ﻪﺘﻀﻭﻤﺤ ﻭﻫ

pK_A =3 .

ﺭﻴﺎﻌﻨ ﻻﻭﻠﺤﻤ ﻥﻤ

ﻥﻴﺭﺒﺴﻷﺍ ﻪﻤﺠﺤ

V_A = 20 mL ﻭ

ﻩﺯﻴﻜﺭﺘ c_A

لﻭﻠﺤﻤﺒ ﻲﺌﺎﻤ

ﺩﻴﺴﻜﻭﺭﺩﻴﻬﻝ ﻡﻭﻴﺩﻭﺼﻝﺍ

ﻩﺯﻴﻜﺭﺘ c_B = 1,0.10^-2 mol/L

.

ﻥﺇ ﻰﻨﺤﻨﻤ ﻩﺫﻫ ﺓﺭﻴﺎﻌﻤﻝﺍ ـﻝﺍ

ﺔﻴﺭﺘﻤ pH ﺩﻨﻋ ﺜﻤﻤ 20°C

ل ﻲﻓ لﻜﺸﻝﺍ ﻲﻝﺎﺘﻝﺍ .

ﻥﻜﻴﻝ V_B ﻡﺠﺤ لﻭﻠﺤﻤﻝﺍ ﺭﻴﺎﻌﻤﻝﺍ

ﻭ لﺜﻤﻨ ﻙﻝﺫﻜ ﺔﻁﺴﺍﻭﺒ ﺏﻭﺴﺎﺤﻝﺍ

ﻭ ﺞﻤﺎﻨﺭﺒ ﻕﺘﺸﻤﻝﺍ

( )

dVB

pH

. d

/1 ﻥﻴﻋ ﺩﺍﺭﻓﻷﺍ ﺓﺭﻴﺎﻌﻤﻝﺍ ﻭ

ﺓﺭﻴﺎﻌﻤﻝﺍ .

/2 ﺏﺘﻜﺃ ﺔﻝﺩﺎﻌﻤ لﻋﺎﻔﺘ ﺓﺭﻴﺎﻌﻤﻝﺍ .

/3 ﺩﺩﺤ ﻰﻨﺤﻨﻤ ﺓﺭﻴﺎﻌﻤﻝﺍ

ﻭ ﻥﻴﻋ ﻪﺼﺌﺎﺼﺨ .

/4 ﺩﺩﺤ ﻰﻨﺤﻨﻤﻝﺍ ( )

dVB

pH

ﻭ d

ﺭﻜﺫﺍ ﺍﺫﺎﻤﻝ ﻪﻠﺜﻤﻨ

؟

/5 ﻁﻋﺃ ﺕﺎﻴﺜﺍﺩﺤﺇ ﺔﻁﻘﻨ

ﺅﻓﺎﻜﺘﻝﺍ ﻭ ﺔﻘﻴﺭﻁﻝﺍ ﺔﻠﻤﻌﺘﺴﻤﻝﺍ

ﺩﺎﺠﻴﻹ .

/6 ﺎﻤ ﻭﻫ ﻑﺸﺎﻜﻝﺍ ﻥﻭﻠﻤﻝﺍ

ﺏﺴﺎﻨﻤﻝﺍ .

/7 ﺏﺴﺤﺃ ﺯﻴﻜﺭﺘﻝﺍ ﻲﻝﻭﻤﻝﺍ

.

/8 ﻥﻴﺒ

ﻥﺃ لﻭﺤﺘﻝﺍ ﻕﻓﺍﺭﻤﻝﺍ

لﻋﺎﻔﺘﻝ ﺓﺭﻴﺎﻌﻤﻝﺍ ﻭﻫ

ﻡﺎﺘ . ﺏﺴﺤﺃ لﺩﻌﻤ ﻡﺩﻘﺘﻝﺍ ﻲﺌﺎﻬﻨﻝﺍ ﻥﻤ

لﺠﺃ VB = 25 mL .

02 02 02

02 ﻦﻳﺮﻤﺘﻟﺍ ﻦﻳﺮﻤﺘﻟﺍ ﻦﻳﺮﻤﺘﻟﺍ ﻦﻳﺮﻤﺘﻟﺍ

ﻍﺭﻔﻨ ﻲﻓ ﺀﺎﻤﻝﺍ n₀ = 0,1 mol ﻥﻤ

ﺽﻤﺤ ﻙﻴﻭﻨﺎﺒﻭﺭﺒﻝﺍ ﻲﻘﻨﻝﺍ

ﻪﺘﻐﻴﺼ ﺔﻠﻤﺠﻤﻝﺍ C ₃H ₆O2 لﻭﺼﺤﻠﻝ

ﻰﻠﻋ ﻡﺠﺤ

ﻩﺭﺩﻗ V0 = 500 mL ﻥﻤ

لﻭﻠﺤﻤ S0

.

ﻥﺇ ﺍﺫﻫ لﻭﻠﺤﻤﻝﺍ ﺩﺠ

،ﺯﻜﺭﻤ ﻝ ﻙﻝﺫ ﻭ ﺱﺎﻴﻘﻝ

،ﺔﻴﻠﻗﺎﻨﻝﺍ ﺭﻀﺤﻨ

ﺎﻗﻼﻁﻨﺍ ﻥﻤ

لﻭﻠﺤﻤﻝﺍ S0

ﻻﻭﻠﺤﻤ

1

2

Mazigh.batna@yahoo.fr Page 2

ﺍﺭﺨﺁ ﻩﺯﻴﻜﺭﺘ S

C = 2,0.10^-3 mol/L ﻭ

ﻪﻤﺠﺤ V = 1L .

ﻭ pH ﺔﻴﻠﻗﺎﻨﻝﺍ ﺔﻴﻋﻭﻨﻝﺍ لﻭﻠﺤﻤﻠﻝ

ﺔﺴﺎﻘﻤ S ﻲﻓ ﻲﻫ 25°C

:

pH = 3,8 ; σ = 3,58.10^-3 S.m

ﺕﺎﻴﻁﻌﻤﻝﺍ :

mol / m . S 10 . 25 , 3

; S.m/mol 10

. 5 ,

3 ³

O H C 2

O

H_{3 2 5} ^-

−

− λ =

= λ +

/1 ﻁﻋﺃ ﺔﻐﻴﺼﻝﺍ ﻑﺼﻨ

ﺔﻠﺼﻔﻤﻝﺍ ﺽﻤﺤﻝ

ﻙﻴﻭﻨﺎﺒﻭﺭﺒﻝﺍ .

/2 ﺍﺫﺇ ﺕﻤﻠﻋ

ﻥﺃ لﻭﻠﺤﻤﻝﺍ ﻱﺭﺎﺠﺘﻝﺍ

لﻤﻌﺘﺴﻤﻝﺍ ﺭﻴﻀﺤﺘﻝ

لﻭﻠﺤﻤﻝﺍ لﻤﺤﻴ

ﺕﺎﻤﻼﻌﻝﺍ

g/mol 74

M

; 0,99 d

;

% 99

p= = =

، ﺏﺴﺤﺃ ﻡﺠﺤﻝﺍ ﻕﻓﺍﻭﻤﻝﺍ ﺔﻴﻤﻜﻝ

ﺓﺩﺎﻤﻝﺍ n0

.

ﺏﺴﺤﺃ ﺯﻴﻜﺭﺘﻝﺍ c0

لﻭﻠﺤﻤﻠﻝ S0

.

-3 ﺏﺘﻜﺃ ﺔﻝﺩﺎﻌﻤ لﻋﺎﻔﺘﻝﺍ ﻲﺌﺎﻴﻤﻴﻜﻝﺍ

ﺙﺩﺎﺤﻝﺍ ﻥﻴﺒ

ﺽﻤﺤ ﻙﻴﻭﻨﺎﺒﻭﺭﺒﻝﺍ ﻭ

ﺀﺎﻤﻝﺍ .

-4 ﻊﻀ ﻻﻭﺩﺠ ﻑﺼﻴ ﺭﻭﻁﺘ لﻭﺤﺘ 2.10^-3 mol ﻥﻤ

ﺽﻤﺤ ﻙﻴﻭﻨﺎﺒﻭﺭﺒﻝﺍ ﻲﻓ

ﻡﺠﺤ ﻥﻤ ﺀﺎﻤﻝﺍ ﺙﻴﺤ لﺼﺤﻨ

ﻰﻠﻋ ﻡﺠﺤ V = 1 L ﻥﻤ

لﻭﻠﺤﻤﻝﺍ .S

ﻊﻀﻨ x_f = ﻡﺩﻘﺘﻝﺍ ﺩﻨﻋ ﻥﺯﺍﻭﺘﻝﺍ . ﻁﻋﺃ ﺔﻤﻴﻗ ﻡﺩﻘﺘﻝﺍ ﻲﺌﺎﻬﻨﻝﺍ x_max

.

-5 ﻥﻴﺒ

ﻥﺃ

[ ]

-6 لﺎﻤﻌﺘﺴﺎﺒ ﺔﻤﻴﻗ

،pH ﺏﺴﺤﺃ x_f ﻡﺜ لﺩﻌﻤ ﻡﺩﻘﺘﻝﺍ ﻲﺌﺎﻬﻨﻝﺍ . ﺍﺫﺎﻤ ﺞﺘﻨﺘﺴﺘ

؟

-7 ﺩﺠﻭﺃ ﺔﻗﻼﻌﻝﺍ ﻥﻴﺒ ﺔﻴﻠﻗﺎﻨﻝﺍ

،لﻭﻠﺤﻤﻠﻝ σ ﻭ

ﺕﺎﻴﻠﻗﺎﻨﻝﺍ ﺔﻴﻝﻭﻤﻝﺍ

ﺔﻴﺩﺭﺎﺸﻝﺍ λ_{H O}+

3

ﻭ λ −

2 5 3H O

، C

ﻡﺠﺤﻝﺍ ﻭ V

ﻡﺩﻘﺘﻝﺍ xf

ﺩﻨﻋ ﻥﺯﺍﻭﺘﻝﺍ .

-8 لﺎﻤﻌﺘﺴﺎﺒ ﺱﺎﻴﻗ

،ﺔﻴﻠﻗﺎﻨﻝﺍ ﺏﺴﺤﺃ

xf

ﻡﺜ لﺩﻌﻤ ﻡﺩﻘﺘﻝﺍ ﻲﺌﺎﻬﻨﻝﺍ . ﺍﺫﺎﻤ ﺞﺘﻨﺘﺴﺘ

؟

-9 ﻁﻋﺃ ﺔﻤﺌﺎﻗ ﺩﺍﺭﻓﻷﺍ ﺔﻴﺌﺎﻴﻤﻴﻜﻝﺍ ﻲﻓ

ﺔﻝﺎﺤﻝﺍ ﺔﻴﺌﺎﻬﻨﻝﺍ .