CHEM 001 Lecture Notes - Lecture 23: Ph, Weak Base, Lithium Hydroxide
16 Aug 2020
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From the stoichiometric or nominal concentration of sa or sb we can calculate the concentration of all ions, the ph and the poh. For a nominal concentration cha, there is no strong acid ha that remains non-dissociated. For a nominal concentration of base from alkaline earth metal hydroxides (group 2): M(oh)2 (ca(oh)2, sr(oh)2 and ba(oh)2: cm(oh)2 there is no strong base m(oh)2 that remains non-dissociated, each m(oh)2 molecules gives 2 hydroxide ions thus, [oh] = 2 x cm(oh)2 then we calculate poh ph. Weak acids and weak base react only partially with water. Ka values are always small why: with ka <1, the equilibrium lies to the left hand side of the reaction, not many. We have a range of ka values for weak acids: the bigger ka, the stronger the wa the smaller ka, the weaker the wa. We will find them on the shelf as salts", strong electrolytes that dissolve and fully dissociate in water.
