posted by jin .
Predict whether the following solutions are acidic, basic, or nearly neutral:
the answer is neutral, basic, acidic, acidic and i am not sure why
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.
a. NaBr - nearly neutral
b. K2SO3 - basic
c. NH4NO2 - acidic
d. Cr(NO3)3 - acidic