What might cause the pH of a titration to be different from 7.0 at equivalence point?
a) the indicator that is used
b) the initial concentration of the standard solution used
c) hydrolysis of the salt that is formed
d) the initial pH of an unknown substance
e) the self-ionization of water
c) hydrolysis of the salt that is formed and e) the self-ionization of water.
In a titration, the pH at the equivalence point is expected to be 7.0 if a strong acid and a strong base are being titrated, because they react to form water, which has a neutral pH.
However, if the salt formed during the reaction undergoes hydrolysis, it can produce acidic or basic ions that affect the pH of the solution. This can result in a pH that is different from 7.0 at the equivalence point.
Additionally, the self-ionization of water can also affect the pH of the solution. Even in the absence of any added acid or base, water can auto-ionize to produce acidic and basic ions that affect the pH.