Posted by jin on Sunday, July 4, 2010 at 3:22am.
Look to see what the hydrolysis products would be. For example, IF Na^+ and Br^- hydrolyzed, they would produce NaOH and HBr but NaOH is a strong base and HBr is a strong acid; therefore, neither hydrolyze. Thus, neutral.
K2SO3. If K^+ and SO3^- hydrolyze, they produce KOH and H2SO3. You know KOH is a strong base. K^+ doesn't hydrolyze. H2SO3 is a weak acid, the SO3^- DOES hydrolyze, and K2SO3 is basic (strong base/weak acid gives basic soln).
I would have classified NH4NO2 as nearly neutral (apparently that was one of the choices) since NH3 and HNO2 are weak base/weak acid. The pH is 6.27 which is almost neutral.
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