Question

What relative masses of dimethyl amine and dimethyl ammonium chloride do you need to prepare a buffer solution of pH = 10.19?

Answer 1

FoY a basic batter, poH pkb + log Canjuate acid) Brse poH = 14- PH pair. Substtute these alnes Pkb 14-Pka for Conjugete acid base the above equ we get 14-PH14-Pka + log Cenfugate acud) Bosc -Pka + lg Caugate a ud) Base) ie pH 1 (or) PH Pka+ log Brse Cenfuqgate acad

An this reaction di methyl amine e base and dimethyl theconugate acid ammonium chloride is wY C45 189/m0)) pla log cy) + Hcl N H (s1.54 3/mo1) PH for (내), 새 Kb 5-4 X1O4 = base paus For Conjugate acid Ka x Kh1o -14 O-1852X1D Kb 5.4X10 1852x 10 pka -lo Ka = =lo. 73. PH= 10.19 10.73+ log N L CiLet it be x- le log lo 19-10. 73=-0.54 = O 288 ie [ayAH) ie Moar hato of base to O. 288 0.288 acid is LAat Mole x MolaY amass mass We know Imol acid, o-288 mol base is required = 0-288 mol (45.08 3/mol) =12.98 FoY Mass of C NH (base) Ma ss of (C 시벌이 imol (1-54 g/mol) Conj acid) = 81.54 9.