What is the [H 3 O + ] of a solution that is0.250 M in triethylamine((CH 3 CH 2

Question

What is the [H3O+] of a solution that is0.250 M in triethylamine((CH3CH2)3N)? Kb=6.5e-10 pKb=4.19 These are the answers to choose from: A. 0.0158M B. 4.00?10-11 M C. 6.32?10-13 M Any help will be appreciated and I will rate well. What is the [H3O+] of a solution that is0.250 M in triethylamine((CH3CH2)3N)? Kb=6.5e-10 pKb=4.19 These are the answers to choose from: A. 0.0158M B. 4.00?10-11 M C. 6.32?10-13 M Any help will be appreciated and I will rate well. A. 0.0158M B. 4.00?10-11 M C. 6.32?10-13 M

Explanation / Answer

I think you need to check the values you've given of Kb andpKb and your answers maybe. But this is the way to solve :              (CH3CH2) 3 N   +    H2O  --------->    (CH3CH2)3 N H+   +   OH- Initial            0.250                                                         0                              0 Change            -x                                                            +x                           +x Equilibrium (0.250 -x)                                                   x                              x Kb = 6.5 * 10-10 =   x. x / (0.250 - x) Solving for x, gives the value of x = 1.27 *10-5 This the concentration of OH- ion. [H3O +] = Kw / [OH-]              = 10 -14 / (1.27 * 10-5)                =7.87 * 10-10 Hope this helps. Hope this helps.

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