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Which of the following titrations will have an equivalence point with a pH less than 7.00? a. H_3PO_4 with KOH b. H_2SO_4 with NH_3 c. HNO_3 with LiOH d. HCOOH with NaOH
Expert Answer
Answer
The answer is b. i.e. NH3 (weak base) with H2SO4 (strong acid).
The salt formed in this case, (NH4)2SO4 is acidic in nature.
On dissociation, the salt will furnish protons in solution lowering the pH below 7.
The reaction :
NH4+ –> H+ + NH3
