Posted by anonymous on Thursday, April 8, 2010 at 12:34am.
The (base) = 0.210 M aniline.
The (acid) = 8.40 g/molar mass aniline hydrochloride (gives you moles) and that divided by 0.750 L = M
i keep getting docked off. im getting 5.00 but its wrong? the pka is 4.61978 and adding it to .38 for 5. -.-
Using your pKa I get 5.00 also. The only thing I can suggest is that you look up pKa again. My text gives a slightly different number of 4.59 which is enough to make pH = 4.97 or so.
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