A- HYDROLYSIS OF SALTS
We expect solutions of substances such as HCl and HNO2 to be acidic and 
solutions of NaOH and NH3 to be basic.2- Using a measuring cylinder, put 25 mL of a buffer solution (of pH = 7) 
in a 50 mL beaker.9- Put 25 mL of distilled water in a 50 mL beaker and, keeping its 
exposure time to the air as short as possible, record its pH. If the water 
is absolutely pure its pH will be 7.0, but it is very difficult to achieve 
this.Similarly, cations from strong bases, such as Na+ from NaOH or K+
from KOH, do not react with water to affect the pH. Hydrolysis of an anion occurs 
only when it can form a molecule or ion that is a weak electrolyte in reaction with 
water.However, we may be somewhat surprised 
at first to discover that aqueous solutions of some salts such as NaNO2 and 
KC2H3O2 are basic, whereas others such as NH4Cl and FeCl3 are acidic.For example, when NaOH and HNO2 (nitrous acid) react, the salts NaNO2 is 
formed:
NaOH (aq) + HNO2 (aq) -> NaNO2 (aq) + H2O (l) [1]
 Nearly all salts are strong electrolytes and exist as ions in aqueous solutions.Recall 
that salts are the products formed in neutralization reactions of acids and bases.1.2.3.4.