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P. 13
ﻋﻨﺪ ﺗﺨﻔﻴﻒ ﺍﻟﻤﺤﺎﻟﻴﻞ ﻧﺴﺘﺨﺪﻡ ﺍﻟﻌﻼﻗﺔ ﺍﻵﺗﻴﺔ :
ﺗﺮﻛﻴﺰ ﺍﻟﻤﺤﻠﻮﻝ Xﺣﺠﻤﻪ = ﺗﺮﻛﻴﺰ ﺍﻟﻤﺤﻠﻮﻝ Xﺣﺠﻤﻪ
)ﺑﻌﺪ ﺍﻟﺘﺨﻔﻴﻒ( )ﻗﺒﻞ ﺍﻟﺘﺨﻔﻴﻒ(
KCl 30 mL 90 mL )(
0.4 M
ﺍﻟﺤــﻞ
X =X
)( )(
120 X = 30 X 0.4
= 0.1 M
200 mL 4 mol/L )(
HCl 0.3 M HCl X = 0.5 mol /L
0.001 mol = 0.01 X 0.1
0.0045 mol = 0.015 X 0.3 )( = ﺍﻟﺤــﻞ
200 X 0.5 X
= 25 mL
)(
15 ml 0.1 M HCl
X4
=X
=X ﻓﻜﺮﺓ ﻣﺨﺘﻠﻔﺔ
) ( 10 ml
ﺍﻟﺤــﻞ
0.001 + 0.0045 =
=
= 0.22 mol / L
0.01 + 0.015
٩٤
95