The following titration curve was obtained for an unknown weak diprotic acid (H2A) dissolved in 15.00 mL of water. The solution of the unknown acid was titrated with a standardized solution of KOH(aq) with a concentration of 0.09856 M. What is the concentration of the unknown acid

Density and pressure

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

The correct answer should be a.