A pH buffer is a solution that resists changes in pH when acids or bases are added to it—typically, a solution of a weak acid and its conjugate base. What masses of dimethylamine and dimethylammonium chloride do you need to prepare 7.00 L of pH = 12.00 buffer if the total concentration of the two components is 0.500 M? Mass of dimethylamine =   Mass of dimethylammonium chloride =

Fundamentals Of Analytical Chemistry
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Author:Skoog
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Chapter7: Statistical Data Treatment And Evaluation
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Problem 7.10QAP
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A pH buffer is a solution that resists changes in pH when acids or bases are added to it—typically, a solution of a weak acid and its conjugate base. What masses of dimethylamine and dimethylammonium chloride do you need to prepare 7.00 L of pH = 12.00 buffer if the total concentration of the two components is 0.500 M?

Mass of dimethylamine =  

Mass of dimethylammonium chloride =

(the mass of dimethylamine is correct but the mass of dimethylammonium chloride is wrong)

Ratio of (CHala NHe ce
O.0537
(人
0.500M- (H3)]
subslitute Mie uceler e!
0.500m -
0.0537
0.500M -L ((Hs)a NH]
O. 0537 (H2),NH
0.500M
(CH
Oo5oo m
0.475 M
ミ
(1+ 0.053)
(C(H2)2 NH
0.475 M
molari ty =
moles = volume.
Moles f dime Hyl amine =
O.475 mol x 7.00L
3.325 moe
mass of (CH32 NH= 3.325 mol x 45 9/mol= 150g
moles q (CHolaANHa
0.025molx7.00L=0.17S mol
0.175 mol x81-59/mol =
14.39
mass =
Hence, massf dimethylamine =
mass of dimethyl ammoniom chloide
150J
14.39
%3D
Transcribed Image Text:Ratio of (CHala NHe ce O.0537 (人 0.500M- (H3)] subslitute Mie uceler e! 0.500m - 0.0537 0.500M -L ((Hs)a NH] O. 0537 (H2),NH 0.500M (CH Oo5oo m 0.475 M ミ (1+ 0.053) (C(H2)2 NH 0.475 M molari ty = moles = volume. Moles f dime Hyl amine = O.475 mol x 7.00L 3.325 moe mass of (CH32 NH= 3.325 mol x 45 9/mol= 150g moles q (CHolaANHa 0.025molx7.00L=0.17S mol 0.175 mol x81-59/mol = 14.39 mass = Hence, massf dimethylamine = mass of dimethyl ammoniom chloide 150J 14.39 %3D
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