CHEM102 Lecture Notes - Lecture 11: Phosphate, Morphine, Ph
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24 Sep 2017
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Morphine is a naturally occurring base which is used to relieve pain. Mor (aq) + h2o(l) (cid:1) hmor+(aq) + oh-(aq) [mor] x2 x = 1. 6 x 10-6 x 0. 010 = 1. 3 x 10-4. Therefore assumption is valid x = [oh-] = 1. 3 x 10-4 m poh = - log [oh-] = - log 1. 3 x 10-4 = 3. 90 ph = 14. 00 3. 90 = 10. 10 x 100 = 1. 3 % Acids containing more than one ionizable proton and so they have more than one ka values. Ka1 / ka2 = (7. 1 x 10-3 / 6. 3 x 10-8) = 1. 1 x 105. Therefore, for ph calculations, h3o+ from the second (and third) dissociations are negligible. Relationship between ka and kb of a conjugate acid-base pair. For an acid ha, it dissociates in water according to equation: For conjugate base 1, its reaction with water is. Ha (aq) + h2o (l) (cid:1) h3o+(aq) + a- (aq)
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