Question

9. What is the pH of a 0.05M solution of diethylamine? (ICH,CH), NH)? ilgnore activities) 10. What is the pH of a solution which contains 0.05 moles benzoic acid and 0.075 moles sodium benzoate dissolved to make 0.5000 L of solution? (Ignore Activities)

Answer 1

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1 Kb for (CH3 CH2)2NH = aus 6.9 x 10-4 ICE Table concentration (M) (CH₂ CH₂ k NH (aq) + H₂O1R1 (CH3 CH₂ ) NH₂ lag) + OH-lag). 0.05 ا +x للا ل 0.05-x Kb = [(CH3 CH2 ), TH₂ ] [OH-] [CF] (H, ), NH[ ] its value of kb is very small, - 6.9 x 10-4 = x2 6.9810-4 = x x x (0.05-x) so we can neglect x in comparison to 0.05 = 5,87 810-3 M. 0.05 COH-] = 20 = 5,87 X10-3M DOH = -log (OH-] = -109 (5,87 X10-3) = 2.23 PH = 14 - A0 H = |4 - 2,03 = 1.71 I PH= 11.77 Anwer