Equivalence point' in an acid base titration is defined as that point where equivalents of acid become equal to equivalents of base.In case of monoprotic acids and bases there is a single equivalence point, whereas in case of polyprotic acids and bases there may be multiple equivalnece points. Depending upon the type of suybstances present, pH of the soution can be calculated at nay equivalence point.
given that:
` Ka_(1),H_(3)PO_(4)=5xx10^(-4)`
`Ka_(2), H_(3)PO=5xx10^(-8)`
`Ka_(3),H_(3)PO_(4)=4.5xx10^(-11)
(Use: log 2 = 0.3, log 3 =0.4)`
What can be concluded about nature of final solution obtained after mixing 50 ml of 0.1 `M H_(3)PO_(4)` with 0.1 M KOH at 298 K if volume of KOH solution added is less than or wequal to 50 mL?

Options

A. Neutral
B. Definitely acidic
C. Definitely basic
D. Nature connot be decided munless volume specified.

Answer

b