Question

i have no idea what to do

& 150M solution of morphine has a pH of 10.5. What is Morphine (CHINO,) is a weak base. A 0.150M solution of morphine has a pH O the Kb for Morphine? Start by writing the full equation including the conjugate an

Answer 1

Let us write ionization equation for the weak bore Morphine (aq) + Holl) - Morphine-Hi har Wear base + 5th conjugate acid Equilibrium expression Kb = [morpholine -H*] [ 8H7 [morpholine] Now we need to find out concentration of [84] and [Morpholine-Ht] and [morpholine] concentration is already given in the question.ie : 0-150 M. We know that pH = -log, [ht] i pH = 10:5 loés - leath (HỊ, vo PH (H+) = 161005 [HT] = 3.162 x 1011 M we can calculate [ok ] from ionic product of water. Kw = [H0] [8] 100x174 = (3.162x107"] xL®H] - 10x1014 - 1 Sw] = 35162x15" - tox 1014 x 10th 3.162 3.162x10-11 TEH] = 0.3162 x 103 m.

LLLLL From the conization equation we known here is a 1:1 molar ratio between [onorphine - H*] and [ 8H] therefore smorphine-H+] = 0.3162x103 M... and concentration of morphine is 0.150 m. (morphine- H+] [ 8H7 [Morphine [0.3162x103] [0-3162x1043) [0.150] ku K6= 0-31624 003162 x 10-6 K6= 0.150 K6= 0.099982 8106 0.150 Kb = 99-982 x 106 150 Kb = 0.6665x106